azure-functions-core-tools: Null reference exception when debugging from VS

Hi Guys,

I have installed Microsoft Visual Studio Enterprise 16.8.0 Preview 2.1 yesterday and now can’t run Azure Functions locally.

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=func
  StackTrace:
   at Azure.Functions.Cli.Utilities.LogLevelExists(IConfigurationRoot hostJsonConfig, String category) in D:\a\1\s\src\Azure.Functions.Cli\Common\Utilities.cs:line 208

Azure Functions Core Tools (3.0.2852 Commit hash: d1c2c8e7dc10a94a399246dda94049a7dbf0383d) Function Runtime Version: 3.0.14287.0

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 25 (6 by maintainers)

Most upvoted comments

Temporary, copied all from AzureFunctionsTools/Releases/ 3.10.0 folder/files into the AzureFunctionsTools/Releases/ 3.11.0.

socialexc on Sep 2, 2020

@jaliyaudagedara

But I am wondering, how come this started happening suddenly?

Core Tools version 3.0.14287.0 was just released and VS updates to the latest version automatically.

pragnagopa on Sep 2, 2020

Fix is merged with the linked PR. New version of core tools is released.

pragnagopa on Sep 4, 2020

Please note that there is a try … catch here

https://github.com/Azure/azure-functions-core-tools/blob/674ea7a0dd605e6c61349839129596841c1a8f30/src/Azure.Functions.Cli/Common/Utilities.cs#L206-L213

Until we release a fix for the null ref, when debugging - please select do not break on this exception.

pragnagopa on Sep 2, 2020

I’m having the exact same issue, just started today. I just ran a function app locally that was running fine a few days ago. Saw that it briefly flashed “downloading core tools” when it started up, so obviously it updated them. Now my app won’t run - I get the same error:

at Azure.Functions.Cli.Utilities.LogLevelExists(IConfigurationRoot hostJsonConfig, String category) in D:\a\1\s\src\Azure.Functions.Cli\Common\Utilities.cs:line 208

This is with:

Azure Functions Core Tools (2.7.2855 Commit hash: 674ea7a0dd605e6c61349839129596841c1a8f30) Function Runtime Version: 2.0.14248.0

Here is my host.json:

{
  "version": "2.0",
  "functionTimeout": "02:00:00",
  "extensions": {
    "serviceBus": {
      "sessionHandlerOptions": {
        "maxAutoRenewDuration": "00:05:00",
        "messageWaitTimeout": "00:00:10",
        "maxConcurrentSessions": 1,
        "autoComplete": true
      }
    }
  }
}

mpnow on Sep 2, 2020