sdk: Cannot load or run lots of my projects in my solution after installing .NET 7

Delete all unused Dotnet runtimes & SDKs via dotnet-core-uninstall

The uninstall tool has an artificial limitation not to uninstall SDK 7+ versions, and the issue is open since August (https://github.com/dotnet/cli-lab/issues/230). Ironically, I tried cloning the repository to apply the fix and run it, but it failed to build because of the exact issue described here.

Sorry you’re dealing with this; it sucks to get an update and then suddenly have your things break.

The official guidance we have for you atm is to uninstall any preview SDKs, like @xt0rted mentioned. Some workload files in some of the preview SDKs will conflict with the RTM / official .NET 7 SDK release. @pascallapradebrite4’s suggestion to delete the microsoft.net.workload.mono.toolchain is also valid and we have been telling people internally to do the same.

As for why, I believe In the middle of preview development some workload content got renamed, with .net7.0 being appended to the end. The reason this happened (multi targeting) is convoluted to say the least and someone else from the team could probably explain it better. We’ve been having discussions about how to prevent the same thing happening when folks upgrade to .NET 8. We are also considering dotnet workload clean which could fix this for you. Thanks, and please let us know of any other feedback or questions here!

Just realized there was still a preview version of the sdk installed. I assumed this would be cleaned up when updating since I never manually installed this, but I guess it wasn’t. After updating I did restart like it suggested so it’s not due to a cleanup task not running yet.

I manually uninstalled 7.0.100-preview.6.22352.1 and that removes microsoft.net.workload.emscripten and microsoft.net.workload.mono.toolchain from C:\Program Files\dotnet\sdk-manifests\7.0.100 which fixed the issue for me.

I tried to hack the problem locally pending a proper fix.

My error message states that there is a conflict between two manifests (macOS arm64, hence the paths): /usr/local/share/dotnet/sdk-manifests/7.0.100/microsoft.net.workload.mono.toolchain/WorkloadManifest.json [...] conflicts with manifest [...] /usr/local/share/dotnet/sdk-manifests/7.0.100/microsoft.net.workload.mono.toolchain.net7/WorkloadManifest.json

I’m not entirely sure how these are intended to work, but I saw “there is a conflict” and thought “what if I remove one of them?”.

So I deleted (moved elsewhere just in case) the .net7 manifest directory specifically, and everything is back to working.

sudo mv /usr/local/share/dotnet/sdk-manifests/7.0.100/microsoft.net.workload.mono.toolchain.net7 ~/dotnet.bak

Now, dotnet restore, dotnet build and dotnet run all work.

Obviously this is just a temporary hack, your mileage may vary, and I don’t know if this can damage some setups, I’m not endorsing that everyone affected should do this while waiting for the fix. Just hoping it can help some people in the meantime.

Edit: I should mention: macOS 13.0 arm64, .NET 7.0 SDK arm64 GA directly, no Visual Studio, here are all my SDKs installed:

6.0.100 [/usr/local/share/dotnet/sdk]
6.0.101 [/usr/local/share/dotnet/sdk]
6.0.102 [/usr/local/share/dotnet/sdk]
6.0.200 [/usr/local/share/dotnet/sdk]
6.0.201 [/usr/local/share/dotnet/sdk]
6.0.300 [/usr/local/share/dotnet/sdk]
6.0.301 [/usr/local/share/dotnet/sdk]
7.0.100-preview.5.22307.18 [/usr/local/share/dotnet/sdk]
7.0.100-preview.6.22352.1 [/usr/local/share/dotnet/sdk]
7.0.100-preview.7.22377.5 [/usr/local/share/dotnet/sdk]
7.0.100-rc.1.22431.12 [/usr/local/share/dotnet/sdk]
7.0.100-rc.2.22477.23 [/usr/local/share/dotnet/sdk]
7.0.100 [/usr/local/share/dotnet/sdk]

Deleting: C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain did the trick for me. I got so frustrated I deleted VS 2022, removed all the frameworks and no luck. A real pain worked like two days but removing that one directory did it. The fact that the install or update that MS created was not smart enough th do that kind of ticks me off, how stupid.

Following up on the workaround by @pascallapradebrite4 if I remove C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain then things start to work again. Removing the microsoft.net.workload.mono.toolchain.net7 folder didn’t help in my instance.

Contents of C:\Program Files\dotnet\sdk-manifests\7.0.100:

❯⠀dir /B
microsoft.net.sdk.android
microsoft.net.sdk.ios
microsoft.net.sdk.maccatalyst
microsoft.net.sdk.macos
microsoft.net.sdk.maui
microsoft.net.sdk.tvos
microsoft.net.workload.emscripten
microsoft.net.workload.emscripten.net6
microsoft.net.workload.emscripten.net7
microsoft.net.workload.mono.toolchain
microsoft.net.workload.mono.toolchain.net6
microsoft.net.workload.mono.toolchain.net7

❯⠀dotnet --info
.NET SDK:
 Version:   7.0.100
 Commit:    e12b7af219

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22621
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\7.0.100\

Host:
  Version:      7.0.0
  Architecture: x64
  Commit:       d099f075e4

.NET SDKs installed:
  2.1.818 [C:\Program Files\dotnet\sdk]
  3.0.103 [C:\Program Files\dotnet\sdk]
  3.1.424 [C:\Program Files\dotnet\sdk]
  5.0.203 [C:\Program Files\dotnet\sdk]
  5.0.214 [C:\Program Files\dotnet\sdk]
  5.0.303 [C:\Program Files\dotnet\sdk]
  5.0.408 [C:\Program Files\dotnet\sdk]
  6.0.100-preview.3.21202.5 [C:\Program Files\dotnet\sdk]
  6.0.202 [C:\Program Files\dotnet\sdk]
  6.0.203 [C:\Program Files\dotnet\sdk]
  6.0.305 [C:\Program Files\dotnet\sdk]
  6.0.401 [C:\Program Files\dotnet\sdk]
  6.0.402 [C:\Program Files\dotnet\sdk]
  7.0.100-preview.6.22352.1 [C:\Program Files\dotnet\sdk]
  7.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.27 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.27 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-preview.3.21201.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.0-preview.6.22330.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.27 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-preview.3.21201.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.0-preview.6.22324.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.30 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.16 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-preview.3.21201.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.0-preview.6.22351.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  arm64 [C:\Program Files\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\arm64\InstallLocation]
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

Uninstalling all of the .NET 7 Preview releases resolved the issue for me

I have the same issue.

Fortunately, I have two computers running the same version of .NET 7.0 / Visual Studio 2022 with the same workloads. One works fine and the other is broken. I checked the path C:\Program Files\dotnet\sdk-manifests\7.0.100 and find that the PC with broken Visual Studio has an extra folder named microsoft.net.workload.mono.toolchain.

I deleted the extra folder, and now the .NET 7.0 / Visual Studio works fine.

The error message:

🤣:  dotnet new --help
Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadManifestCompositionException: 清单“wasm-tools”[microsoft.net.workload.mono.toolchain] 中的工作负载定义“C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain\WorkloadManifest.json”与清单“microsoft.net.workload.mono.toolchain.net7”[C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain.net7\WorkloadManifest.json] 冲突
   at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.ComposeWorkloadManifests()
   at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.Create(IWorkloadManifestProvider manifestProvider, String dotnetRootPath, String sdkVersion, String userProfileDir)
   at Microsoft.DotNet.Workloads.Workload.List.WorkloadInfoHelper..ctor(VerbosityOptions verbosity, String targetSdkVersion, Nullable`1 verifySignatures, IReporter reporter, IWorkloadInstallationRecordRepository workloadRecordRepo, String currentSdkVersion, String dotnetDir, String userProfileDir, IWorkloadResolver workloadResolver)
   at Microsoft.DotNet.Cli.NewCommandParser.CreateHost(Boolean disableSdkTemplates, Boolean disableProjectContext, FileInfo projectPath, FileInfo outputPath, LogLevel logLevel)
   at Microsoft.DotNet.Cli.NewCommandParser.<GetCommand>g__GetEngineHost|11_0(ParseResult parseResult)
   at Microsoft.TemplateEngine.Cli.Commands.BaseCommand.CreateEnvironmentSettings(GlobalArgs args, ParseResult parseResult)
   at Microsoft.TemplateEngine.Cli.Commands.NewCommand.<CustomHelpLayout>b__31_0(HelpContext context)
   at Microsoft.DotNet.Cli.Parser.DotnetHelpBuilder.Write(HelpContext context)
   at System.CommandLine.Invocation.InvocationPipeline.GetExitCode(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.<Invoke>g__FullInvocationChain|3_0(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.Invoke(IConsole console)
   at Microsoft.DotNet.Cli.Program.ProcessArgs(String[] args, TimeSpan startupTime, ITelemetry telemetryClient)
   at Microsoft.DotNet.Cli.Program.Main(String[] args)

Just updated VS and I’m getting the same error when I open my .net 6 projects (without a global.json), as well as when I try to run dotnet ... commands in projects where the sdk was bumped to 7.0.100, switching back to 6.0.402 results in the errors going away.

Project without a global.json targeting net6.0:

❯⠀dotnet new globaljson
Unhandled exception: Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadManifestCompositionException: Workload definition 'wasm-tools' in manifest 'microsoft.net.workload.mono.toolchain' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain\WorkloadManifest.json] conflicts with manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain.net7\WorkloadManifest.json]
   at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.ComposeWorkloadManifests()
   at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.Create(IWorkloadManifestProvider manifestProvider, String dotnetRootPath, String sdkVersion, String userProfileDir)
   at Microsoft.DotNet.Workloads.Workload.List.WorkloadInfoHelper..ctor(VerbosityOptions verbosity, String targetSdkVersion, Nullable`1 verifySignatures, IReporter reporter, IWorkloadInstallationRecordRepository workloadRecordRepo, String currentSdkVersion, String dotnetDir, String userProfileDir, IWorkloadResolver workloadResolver)
   at Microsoft.DotNet.Cli.NewCommandParser.CreateHost(Boolean disableSdkTemplates, Boolean disableProjectContext, FileInfo projectPath, FileInfo outputPath, LogLevel logLevel)
   at Microsoft.DotNet.Cli.NewCommandParser.<GetCommand>g__GetEngineHost|11_0(ParseResult parseResult)
   at Microsoft.TemplateEngine.Cli.Commands.BaseCommand.CreateEnvironmentSettings(GlobalArgs args, ParseResult parseResult)
   at Microsoft.TemplateEngine.Cli.Commands.BaseCommand`1.InvokeAsync(InvocationContext context)
   at Microsoft.TemplateEngine.Cli.Commands.BaseCommand`1.Invoke(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.DotNet.Cli.Parser.<>c__DisplayClass17_0.<<UseParseErrorReporting>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass11_0.<<UseHelp>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__17_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass15_0.<<UseParseDirective>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass7_0.<<UseExceptionHandler>b__0>d.MoveNext()

Project with a global.json pinned to 7.0.100 and targeting net6.0:

❯⠀dotnet tool restore
C:\Users\brian\AppData\Local\Temp\c296991e-f923-4229-8180-492a3f6e3183\restore.csproj(5,31): error MSB4242: SDK Resolver Failure: "The SDK resolver "Microsoft.DotNet.MSBuildWorkloadSdkResolver" failed while attempting to resolve the SDK "Microsoft.NET
.SdC:\Users\brian\AppData\Local\Temp\6612f8be-9856-44c2-b7fb-d88752dc0763\restore.csproj(5,31): error MSB4242: SDK Resolver Failure: "The SDK resolver "Microsoft.DotNet.MSBuildWorkloadSdkResolver" failed while attempting to resolve the SDK "Microsoft.NET
.Sdk". Exception: "Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadManifestCompositionException: Workload definition 'wasm-tools' in manifest 'microsoft.net.workload.mono.toolchain' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workloa 
d.mono.toolchain\WorkloadManifest.json] conflicts with manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain.net7\WorkloadManifest.json]
C:\Users\brian\AppData\Local\Temp\6612fC:\Users\brian\AppData\Local\Temp\27a236df-c809-48b8-b7a0-e6e7e874c576\restore.csproj(5,31): error MSB4242: SDK Resolver Failure: "The SDK resolver "Microsoft.DotNet.MSBuildWorkloadSdkResolver" failed while attempting to resolve the SDK "Microsoft.NET
.Sdk". Exception: "Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadManifestCompositionException: Workload definition 'wasm-tools' in manifest 'microsoft.net.workload.mono.toolchain' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workloa 
d.mono8be-9856-44c2-b7fb-d88752dc0763\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.ComposeWorkloadManifests()
C:\Users\brian\AppData\Local\Temp\6612f8be-9856-44c2-b7fb-d88752dc0763\restore.csproj(5,31): erk". Exception: "Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadManifestCompositionException: Workload definition 'wasm-tools' in manifest 'microsoft.net.workload.mono.toolchain' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workloa
d.mono.toolchain\WorkloadManifest.json] conflicts with manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain.net7\WorkloadManifest.json]
C:\Users\brian\AppData\Local\Temp\27a23ror MSB4242:    at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.Create(IWorkloadManifestProvider manifestProvider, String dotnetRootPath, Strin
g sdkVersion, String userProfileDir)
C:\Users\brian\AppData\Local\Temp\6612f8be-9856-44c2-b7fb-d88752dc0763\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.CachingWorkloadResolver.Resolve(String sdkReferenceName, String dotnetRootPath, String sdkVe 
rsion, String userProfileDir)
C:\Users\brian\AppData\Local\Tem6df-c809-48b8-b7a0-e6e7e874c576\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.ComposeWorkloadManifests()
C:\Users\brian\AppData\Local\Temp\27a236df-c809-48b8-b7a0-e6e7e874c576\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.Create(IWorkloadManifestProvider manifestProvider, String dotnetRootPath, Strin 
g sdkVersion, String userProfileDir)
C:\Users\brian\AppData\Local\Temp\27a236df-c809-48b8-b7a0-e6e7e874c576\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.CachingWorkloadResolver.Resolve(String sdkReferenceName, String dotnetRootPath, String sdkVe 
rsion, String userProfileDir)
C:\Users\brian\AppData\Local\Temp\27a236df-c809-48b8-b7a0-e6e7e874c576\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.WorkloadSdkResolver.Resolve(SdkReference sdkReference, SdkResolverContext resolverContext, S 
dkResultFactory factory)
C:\Users\p\6612f8be-9856-44c2-b7fb-d88752dc0763\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.WorkloadSdkResolver.Resolve(SdkReference sdkReference, SdkResolverContext resolverContext, S
dkResultFactory factory)
C:\Users\.toolchain\WorkloadManifest.json] conflicts with manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain.net7\WorkloadManifest.json]
C:\Users\brian\AppData\Local\Temp\c2969brian\AppData\Local\Temp\27a236df-c809-48b8-b7a0-e6e7e874c576\restore.csproj(5,31): error MSB4242:    at Microsoft.Build.BackEnd.SdkResolution.SdkResolverService.TryResolveSdkUsingSpecifiedResolvers(IList`1 resolvers, Int32 submissionId, SdkR
eference sdkbrian\AppData\Local\Temp\6612f8be-9856-44c2-b7fb-d88752dc0763\restore.csproj(5,31): error MSB4242:    at Microsoft.Build.BackEnd.SdkResolution.SdkResolverService.TryResolveSdkUsingSpecifiedResolvers(IList`1 resolvers, Int32 submissionId, SdkR
eference sdk91e-f923-4229-8180-492a3f6e3183\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.ComposeWorkloadManifests()
C:\Users\brian\AppData\Local\Temp\c296991e-f923-4229-8180-492a3f6e3183\restore.csproj(5,31): er, LoggingContext loggingContext, ElementLocation sdkReferenceLocation, String solutionPath, String projectPath, Boolean interactive, Boolean isRunningInVisualStudio, SdkResult& sdkResult)""
, LoggingContext loggingContext, ElementLocation sdkReferenceLocation, String solutionPath, String projectPath, Boolean interactive, Boolean isRunningInVisualStudio, SdkResult& sdkResult)""
ror MSB4242:    at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.Create(IWorkloadManifestProvider manifestProvider, String dotnetRootPath, Strin
g sdkVersion, String userProfileDir)
C:\Users\brian\AppData\Local\Temp\c296991e-f923-4229-8180-492a3f6e3183\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.CachingWorkloadResolver.Resolve(String sdkReferenceName, String dotnetRootPath, String sdkVe 
rsion, String userProfileDir)
C:\Users\brian\AppData\Local\Temp\c296991e-f923-4229-8180-492a3f6e3183\restore.csproj(5,31): error MSB4242:    at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.WorkloadSdkResolver.Resolve(SdkReference sdkReference, SdkResolverContext resolverContext, S 
dkResultFactory factory)
C:\Users\brian\AppData\Local\Temp\c296991e-f923-4229-8180-492a3f6e3183\restore.csproj(5,31): error MSB4242:    at Microsoft.Build.BackEnd.SdkResolution.SdkResolverService.TryResolveSdkUsingSpecifiedResolvers(IList`1 resolvers, Int32 submissionId, SdkR 
eference sdk, LoggingContext loggingContext, ElementLocation sdkReferenceLocation, String solutionPath, String projectPath, Boolean interactive, Boolean isRunningInVisualStudio, SdkResult& sdkResult)""

Package "mockaco" failed to restore, due to Microsoft.DotNet.ToolPackage.ToolPackageException: The tool package could not be restored.
   at Microsoft.DotNet.Tools.Tool.Install.ProjectRestorer.Restore(FilePath project, PackageLocation packageLocation, String verbosity)
   at Microsoft.DotNet.ToolPackage.ToolPackageInstaller.InstallPackageToExternalManagedLocation(PackageLocation packageLocation, PackageId packageId, VersionRange versionRange, String targetFramework, String verbosity)
   at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)
Package "run-script" failed to restore, due to Microsoft.DotNet.ToolPackage.ToolPackageException: The tool package could not be restored.
   at Microsoft.DotNet.Tools.Tool.Install.ProjectRestorer.Restore(FilePath project, PackageLocation packageLocation, String verbosity)
   at Microsoft.DotNet.ToolPackage.ToolPackageInstaller.InstallPackageToExternalManagedLocation(PackageLocation packageLocation, PackageId packageId, VersionRange versionRange, String targetFramework, String verbosity)
   at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)
Package "startup-projects" failed to restore, due to Microsoft.DotNet.ToolPackage.ToolPackageException: The tool package could not be restored.
   at Microsoft.DotNet.Tools.Tool.Install.ProjectRestorer.Restore(FilePath project, PackageLocation packageLocation, String verbosity)
   at Microsoft.DotNet.ToolPackage.ToolPackageInstaller.InstallPackageToExternalManagedLocation(PackageLocation packageLocation, PackageId packageId, VersionRange versionRange, String targetFramework, String verbosity)
   at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)

Tool 'rimraf' (version '0.1.0') was restored. Available commands: rimraf

Restore partially failed.

I have installed everything from zero. Now everything works. Thanks for help.

I only unintall the NET CORE 7 preview from my PC and It works for me. I hope that It will be usefull

Had the same problem on Macbook Arm64

What helped me:

1. Remove VS 2022 for Mac
2. Removing .net sdk and runtimes (https://learn.microsoft.com/en-gb/dotnet/core/additional-tools/uninstall-tool?tabs=macos and some manual scripts to remove .net 7 and dotnet folders in /etc and /usr/local/share folders)
3. Install .net 7 and only after that step to install .net 6
4. Intall VS for Mac.

Also i checked in Rider 2022.2 and 2022.3 EAP 7 and works fine there as well

ended up removing /usr/local/share/dotnet/sdk and /usr/local/share/dotnet/sdk-manifests. then reinstalled .net 7 followed by .net 6. was finally able to load the projects again with rider.

@sencagri

I’m going to pin the solution that worked for most people by editing it and appending it to the top of your comment. Following up here to try to help with your specific scenario. I saw the error you mentioned here:

4>C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(376,5): error NETSDK1127: The targeting pack Microsoft.Android is not installed. Please restore and try again

I’m pretty sure the intention of that error was to get you to do a nuget restore but I’m not sure if that will really solve the situation as your machine is probably in a pretty weird state. I saw you mentioned reinstalling the .NET 7 SDK but more information here would be helpful.

Please try doing an uninstall of all .NET 7 SDKs, since you’re on windows you can easily do this in the Add or Remove Programs window. Visual Studio may also have .NET 7 preview SDKs installed, after the uninstall go to the VS Installer, Modify existing VS Installations, Individual Components, and make sure there are no remaining .NET 7 SDKs.

Then re-install a single copy of the .NET 7 RTM SDK. If it doesn’t work with a clean installation, please report back what errors you get trying to build so we can take another look.

In my case, on Mac I had to

1. Delete all unused Dotnet runtimes & SDKs via dotnet-core-uninstall (https://github.com/dotnet/cli-lab/releases)
2. Remove all folders in /usr/local/share/dotnet/sdk-manifests
3. Re-install required .Net SDKs