vscode-csharp: v1.23.1 fails to load Unity project, worked with v1.23.0

Issue Description

After upgrading to v1.23.1, I get “Some projects have trouble loading. Please review the output for more details.” and autocomplete etc. doesn’t work on my Unity 2019.4 project. Restarting vscode does not help.

Downgrading to v1.23.0 fixes it.

Platform: Ubuntu 18.04 with the latest Mono installed from their APT repo deb https://download.mono-project.com/repo/ubuntu stable-bionic main and with dotnet 3.1.401 installed from Microsoft’s APT repo.

Logs

OmniSharp log

Starting OmniSharp server at 8/20/2020, 10:06:01 AM Target: /path/to/project/projectname.sln

OmniSharp server started. Path: /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/run PID: 15283

    Starting OmniSharp on ubuntu 18.4 (x64)

    DotNetPath set to dotnet

    Located 1 MSBuild instance(s)
        1: StandAlone 16.8.0 - "/home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin"

    MSBUILD_EXE_PATH environment variable set to '/home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/MSBuild.exe'

    Registered MSBuild instance: StandAlone 16.8.0 - "/home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin"
        CscToolExe = csc.exe
        MSBuildToolsPath = /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin
        CscToolPath = /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Roslyn
        BypassFrameworkInstallChecks = true
        MSBuildExtensionsPath = /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild

    Detecting Cake files in '/path/to/project'.

    Could not find any Cake files

    Detecting projects in '/path/to/project/projectname.sln'.

    Queue project update for '/path/to/project/com.unity.multiplayer-hlapi.Runtime.csproj'

    Queue project update for '/path/to/project/UnityEngine.UI.csproj'

    Queue project update for '/path/to/project/UnityEngine.TestRunner.csproj'

    Queue project update for '/path/to/project/Assembly-CSharp.csproj'

    Queue project update for '/path/to/project/com.unity.multiplayer-hlapi.Tests.csproj'

    Queue project update for '/path/to/project/ThirdParty.csproj'

    Queue project update for '/path/to/project/ProjectNameProtoMain.csproj'

    Queue project update for '/path/to/project/GooglePlayGames.csproj'

    Queue project update for '/path/to/project/PxlAssembly.csproj'

    Queue project update for '/path/to/project/PixelIAP.csproj'

    Queue project update for '/path/to/project/Coffee.SoftMaskForUGUI.csproj'

    Queue project update for '/path/to/project/PxlPlayModeTestsAssembly.csproj'

    Queue project update for '/path/to/project/UnityEditor.TestRunner.csproj'

    Queue project update for '/path/to/project/Unity.2D.Sprite.Editor.csproj'

    Queue project update for '/path/to/project/com.unity.multiplayer-hlapi.Editor.csproj'

    Queue project update for '/path/to/project/Coffee.SoftMaskForUGUI.Editor.csproj'

    Queue project update for '/path/to/project/UnityEditor.UI.csproj'

    Queue project update for '/path/to/project/Unity.2D.Tilemap.Editor.csproj'

    Queue project update for '/path/to/project/ThirdParty-Editor.csproj'

    Queue project update for '/path/to/project/Assembly-CSharp-Editor.csproj'

    Queue project update for '/path/to/project/PxlTestsAssembly.csproj'

    Queue project update for '/path/to/project/GooglePlayGamesEditor.csproj'

    Queue project update for '/path/to/project/com.unity.multiplayer-weaver.Editor.csproj'

    Queue project update for '/path/to/project/Unity.VSCode.Editor.csproj'

    Queue project update for '/path/to/project/com.unity.multiplayer-hlapi.EditorTests.csproj'

    Detecting CSX files in '/path/to/project'.

    Could not find any CSX files

    Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0

    Loading project: /path/to/project/com.unity.multiplayer-hlapi.Runtime.csproj

    Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100

    Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.ImplementTypeWorkspaceOptionsProvider, Order: 110

    Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.BlockStructureWorkspaceOptionsProvider, Order: 140

    Configuration finished.

    Omnisharp server running using Stdio at location '/path/to/project' on host 14751.

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/com.unity.multiplayer-hlapi.Runtime.csproj'.

/path/to/project/com.unity.multiplayer-hlapi.Runtime.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/UnityEngine.UI.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/UnityEngine.UI.csproj'.

/path/to/project/UnityEngine.UI.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/UnityEngine.TestRunner.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/UnityEngine.TestRunner.csproj'.

/path/to/project/UnityEngine.TestRunner.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Assembly-CSharp.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Assembly-CSharp.csproj'.

/path/to/project/Assembly-CSharp.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/com.unity.multiplayer-hlapi.Tests.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/com.unity.multiplayer-hlapi.Tests.csproj'.

/path/to/project/com.unity.multiplayer-hlapi.Tests.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/ThirdParty.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/ThirdParty.csproj'.

/path/to/project/ThirdParty.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/ProjectNameProtoMain.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/ProjectNameProtoMain.csproj'.

/path/to/project/ProjectNameProtoMain.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/GooglePlayGames.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/GooglePlayGames.csproj'.

/path/to/project/GooglePlayGames.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/PxlAssembly.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/PxlAssembly.csproj'.

/path/to/project/PxlAssembly.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/PixelIAP.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/PixelIAP.csproj'.

/path/to/project/PixelIAP.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Coffee.SoftMaskForUGUI.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Coffee.SoftMaskForUGUI.csproj'.

/path/to/project/Coffee.SoftMaskForUGUI.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/PxlPlayModeTestsAssembly.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/PxlPlayModeTestsAssembly.csproj'.

/path/to/project/PxlPlayModeTestsAssembly.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/UnityEditor.TestRunner.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/UnityEditor.TestRunner.csproj'.

/path/to/project/UnityEditor.TestRunner.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Unity.2D.Sprite.Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Unity.2D.Sprite.Editor.csproj'.

/path/to/project/Unity.2D.Sprite.Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/com.unity.multiplayer-hlapi.Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/com.unity.multiplayer-hlapi.Editor.csproj'.

/path/to/project/com.unity.multiplayer-hlapi.Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Coffee.SoftMaskForUGUI.Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Coffee.SoftMaskForUGUI.Editor.csproj'.

/path/to/project/Coffee.SoftMaskForUGUI.Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/UnityEditor.UI.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/UnityEditor.UI.csproj'.

/path/to/project/UnityEditor.UI.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Unity.2D.Tilemap.Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Unity.2D.Tilemap.Editor.csproj'.

/path/to/project/Unity.2D.Tilemap.Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/ThirdParty-Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/ThirdParty-Editor.csproj'.

/path/to/project/ThirdParty-Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Assembly-CSharp-Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Assembly-CSharp-Editor.csproj'.

/path/to/project/Assembly-CSharp-Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/PxlTestsAssembly.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/PxlTestsAssembly.csproj'.

/path/to/project/PxlTestsAssembly.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/GooglePlayGamesEditor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/GooglePlayGamesEditor.csproj'.

/path/to/project/GooglePlayGamesEditor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/com.unity.multiplayer-weaver.Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/com.unity.multiplayer-weaver.Editor.csproj'.

/path/to/project/com.unity.multiplayer-weaver.Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/Unity.VSCode.Editor.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/Unity.VSCode.Editor.csproj'.

/path/to/project/Unity.VSCode.Editor.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Loading project: /path/to/project/com.unity.multiplayer-hlapi.EditorTests.csproj

    The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Failed to load project file '/path/to/project/com.unity.multiplayer-hlapi.EditorTests.csproj'.

/path/to/project/com.unity.multiplayer-hlapi.EditorTests.csproj /home/username/.vscode/extensions/ms-dotnettools.csharp-1.23.1/.omnisharp/1.37.0/omnisharp/.msbuild/Current/Bin/Microsoft.Common.CurrentVersion.targets(1178,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

    Attempted to update project that is not loaded: /path/to/project/com.unity.multiplayer-hlapi.Runtime.csproj

    Attempted to update project that is not loaded: /path/to/project/UnityEngine.UI.csproj

    Attempted to update project that is not loaded: /path/to/project/UnityEngine.TestRunner.csproj

    Attempted to update project that is not loaded: /path/to/project/Assembly-CSharp.csproj

    Attempted to update project that is not loaded: /path/to/project/com.unity.multiplayer-hlapi.Tests.csproj

    Attempted to update project that is not loaded: /path/to/project/ThirdParty.csproj

    Attempted to update project that is not loaded: /path/to/project/ProjectNameProtoMain.csproj

    Attempted to update project that is not loaded: /path/to/project/GooglePlayGames.csproj

    Attempted to update project that is not loaded: /path/to/project/PxlAssembly.csproj

    Attempted to update project that is not loaded: /path/to/project/PixelIAP.csproj

    Attempted to update project that is not loaded: /path/to/project/Coffee.SoftMaskForUGUI.csproj

    Attempted to update project that is not loaded: /path/to/project/PxlPlayModeTestsAssembly.csproj

    Attempted to update project that is not loaded: /path/to/project/UnityEditor.TestRunner.csproj

    Attempted to update project that is not loaded: /path/to/project/Unity.2D.Sprite.Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/com.unity.multiplayer-hlapi.Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/Coffee.SoftMaskForUGUI.Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/UnityEditor.UI.csproj

    Attempted to update project that is not loaded: /path/to/project/Unity.2D.Tilemap.Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/ThirdParty-Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/Assembly-CSharp-Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/PxlTestsAssembly.csproj

    Attempted to update project that is not loaded: /path/to/project/GooglePlayGamesEditor.csproj

    Attempted to update project that is not loaded: /path/to/project/com.unity.multiplayer-weaver.Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/Unity.VSCode.Editor.csproj

    Attempted to update project that is not loaded: /path/to/project/com.unity.multiplayer-hlapi.EditorTests.csproj

C# log

Installing C# dependencies... Platform: linux, x86_64, name=ubuntu, version=18.04

Downloading package ‘OmniSharp for Linux (x64)’ (47056 KB)… Done! Validating download… Integrity Check succeeded. Installing package ‘OmniSharp for Linux (x64)’

Downloading package ‘.NET Core Debugger (linux / x64)’ (54671 KB)… Done! Validating download… Integrity Check succeeded. Installing package ‘.NET Core Debugger (linux / x64)’

Downloading package ‘Razor Language Server (Linux / x64)’ (52580 KB)… Done! Installing package ‘Razor Language Server (Linux / x64)’

Finished

Environment information

VSCode version: 1.48.0 C# Extension: 1.23.1

Mono Information

OmniSharp using built-in mono

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.1.401 Commit: 39d17847db

Runtime Environment: OS Name: ubuntu OS Version: 18.04 OS Platform: Linux RID: ubuntu.18.04-x64 Base Path: /usr/share/dotnet/sdk/3.1.401/

Host (useful for support): Version: 3.1.7 Commit: fcfdef8d6b

.NET Core SDKs installed: 2.2.402 [/usr/share/dotnet/sdk] 3.0.103 [/usr/share/dotnet/sdk] 3.1.401 [/usr/share/dotnet/sdk]

.NET Core runtimes installed: Microsoft.AspNetCore.All 2.2.8 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 2.2.8 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.0.3 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.7 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.2.8 [/usr/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 3.0.3 [/usr/share/dotnet/shared/Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.7 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs: https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
cpptools	ms-vscode	0.29.0
csharp	ms-dotnettools	1.23.1
jsonnet	heptio	0.1.0
jsonnet-formatter	xrc-inc	0.3.0
unity-debug	Unity	2.7.5
vscode-eclipse-keybindings	alphabotsec	0.12.0
vscode-proto3	zxh404	0.4.2

About this issue

Original URL
State: closed
Created 4 years ago
Reactions: 8
Comments: 32 (10 by maintainers)

Most upvoted comments

The problem is that the new .NET Core 3.1 SDK isn’t supported by any current Mono release, so the setting "omnisharp.useGlobalMono" has been changed to "never" in 1.23.1 (see changelog https://github.com/OmniSharp/omnisharp-vscode/blob/master/CHANGELOG.md#1231-not-yet-released). This however is incompatible with Mono-based development e.g. Unity.

You can change it back yourself to "omnisharp.useGlobalMono": "always" which should fix your scenario.

+99

filipw on Aug 20, 2020

Sample problem here on macOS. It’s really annoying that this all of a sudden broke Unity support in VSCode. 😕 This will affect a lot of people, I guess.

Hint for other users: The setting in the OmniSharp config dialog is called “Omnisharp: Use Global Mono”. I can confirm that setting this to “always” solved the problem.

+16

derwaldgeist on Aug 20, 2020

As a Unity developer, I hate losing a half hour or more of work every time I upgrade the C# plugin. It happens at least quarterly. And then I have to find the ticket explaining what got changed. Do I need to pressure Unity to care about this? I feel like they owe the c# extension devs quite a lot.

I feel you, but I suspect that you’re not impressing anyone here when you say you spent half an hour chasing something down. I like to look at it the positive way – an opportunity to learn about new things and how hard others have had to work to make sure that your experience is as good as it is. Otherwise, I would say reconsider what it is that you think you know about the deployment complexities of C#, VSC, and Unity interwoven together.

Oh also, if you are interested in further others’ efforts that maintain the codebases that support your world, you probably could at least transmute that negative energy into posting your system info, what you tested/tried lately (regression), and what debug info you’re seeing.

+11

drew-512 on Sep 1, 2020

The problem is that the new .NET Core 3.1 SDK isn’t supported by any current Mono release, so the setting "omnisharp.useGlobalMono" has been changed to "never" in 1.23.1 (see changelog https://github.com/OmniSharp/omnisharp-vscode/blob/master/CHANGELOG.md#1231-not-yet-released). This however is incompatible with Mono-based development e.g. Unity.

I tried all this with no success. Turned out the issue was that were old auto-generated .csproj files from Unity that were confusing VS/C# throughly. Anyone experiencing this I recommend nuking all your .csproj and .sln files and re-opening your project in Unity. The switch to 1.23 for whatever reason started to access those old project files instead.

drew-512 on Aug 24, 2020

in VS Code settings (there is an icon to switch to JSON view) or use the option “Omnisharp: Use Global Mono” in the UI view of the settings

filipw on Aug 22, 2020

@Thaina How can I revert to a previous version?

here

Thaina on Oct 13, 2020

Hey guys, calm down, this is in fact a pretty complex tech setup, and I appreciate the work of its maintainers.

I agree with @zachstronaut in one aspect: I’m also struggling every time I want to setup a new Unity project with the C# VSCode extensions. Sometimes it works right away, sometimes just nothing happens (no intellisense, no references). Sometimes, there is only one .sln file being generated, sometimes it’s a whole bunch of them. To be honest, I don’t have the slightest clue what they are for. (I guess they somehow contain hints about C# assemblies, but I am not really sure.)

It would be awesome to have an in-depth guide that explains the fundamentals of the setup, especially what all these .sln files actually mean and how to trouble-shoot a setup that won’t work. The log file outputs of OmniSharp alone are all double Dutch to me. I guess that would be more a task for Unity themselves, but I am not sure how to reach them. Maybe you have direct contacts there so you could address this? Happy to help if you need more explanations from a pure user / Unity dev perspective.

derwaldgeist on Sep 2, 2020

this is caused not by OmniSharp but by the Unity extension. Please ensure that you have updated your VSCode Editor package in Unity to version 1.2.3. See the comments in this issue for more details - https://github.com/OmniSharp/omnisharp-vscode/issues/4113#issuecomment-718006809

I will close this as duplicate of https://github.com/OmniSharp/omnisharp-vscode/issues/4180 and several other issues - thanks.

filipw on Nov 10, 2020

As a Unity developer, I hate losing a half hour or more of work every time I upgrade the C# plugin. It happens at least quarterly. And then I have to find the ticket explaining what got changed. Do I need to pressure Unity to care about this? I feel like they owe the c# extension devs quite a lot.

I feel you, but I suspect that you’re not impressing anyone here when you say you spent half an hour chasing something down. I like to look at it the positive way – an opportunity to learn about new things and how hard others have had to work to make sure that your experience is as good as it is. Otherwise, I would say reconsider what it is that you think you know about the deployment complexities of C#, VSC, and Unity interwoven together.

Oh also, if you are interested in further others’ efforts that maintain the codebases that support your world, you probably could at least transmute that negative energy into posting your system info, what you tested/tried lately (regression), and what debug info you’re seeing.

Nothing you said is relevant to the situation. You’re just chiming in to insult me. Feel better?

zachstronaut on Sep 1, 2020

As a Unity developer, I hate losing a half hour or more of work every time I upgrade the C# plugin. It happens at least quarterly. And then I have to find the ticket explaining what got changed. Do I need to pressure Unity to care about this? I feel like they owe the c# extension devs quite a lot.

The problem is that the new .NET Core 3.1 SDK isn’t supported by any current Mono release, so the setting "omnisharp.useGlobalMono" has been changed to "never" in 1.23.1 (see changelog https://github.com/OmniSharp/omnisharp-vscode/blob/master/CHANGELOG.md#1231-not-yet-released). This however is incompatible with Mono-based development e.g. Unity.

You can change it back yourself to "omnisharp.useGlobalMono": "always" which should fix your scenario.

zachstronaut on Sep 1, 2020

@filipw Had the same issue as @mpartel, but setting it to “auto” didn’t fix it. “always” did the trick though… I’m on macos 10.15.6, he seems to be on Ubuntu.

juniordiscart on Aug 20, 2020

in VS Code settings (there is an icon to switch to JSON view) or use the option “Omnisharp: Use Global Mono” in the UI view of the settings

You just made me the happiest I have been all month. Thank you so much.

Kromilan on Aug 22, 2020

sorry I meant always 😂

filipw on Aug 20, 2020