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I have recently upgraded my .Netcore webapi from 2.2 to 3.1 and deployed to azure app services. Since then I got the below issue. I have reverted the release but still getting the same error. I found few solutions for IIS but nothing for Azure app services .How to fix this? enter image description here

mohan
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1 Answers1

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[NEWEST]

Solution:

Reduce the version of Microsoft.Extensions.Configuration.Abstractions to 3.1.17 or 3.1.16.

Troubleshooting:

  1. Try to find Microsoft.Extensions.Configuration.Abstractions on scm site.

  2. I guess it don't include Microsoft.Extensions.Configuration.Abstractions package when deploy, so try to use below code in .csproj file. But it failed.

    enter image description here

  3. I try to find the reason on scm site, and I find it. On azure, .net core 3.1 just support the version of Microsoft.Extensions.Configuration.Abstractions are 3.1.17 and 3.1.16.

    enter image description here

[PREVIOUS] The way to find the error logs

Judging from the error message, your webapp did not start. To solve the problem, we can only locate the error by querying the log.

You have the following two solutions to solve the problem. View the log:

Prerequisite: If you have successfully deployed the project before, please log in to the scm site to clean up all the files in the original wwwroot folder.

Plan 1:

Find the web.config file in the wwwroot folder and set stdoutLogEnabled="true".

You can refer to the following posts and github issues.

  1. Azure Web App - Python: can't open file 'manage.py': [Errno 0] No error

  2. How to enable stdoutLogEnabled=true when site is deployed with Run From Package

After add the settings in web.config, we can check the logs.

Plan 2:

Follow below picture, check Application Event Logs.

enter image description here

You also can refer my answer to Collect .NET Profiler Trace (Azure - Unhandled Exception: System.IO.FileNotFoundException).

After find the error, you can solve it quickly. If you also have some problem, you can create a new project without any sensitive info for us to reproduce your issues.

Hameed Syed
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Jason Pan
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  • Thanks for the help ! I have enabled stdoutLogEnabled="true" in web.config .It stdoutLog it shows the following error . Unhandled exception. System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Configuration.Abstractions, Version=5.0.0.0, Culture=neutralThe located assembly's manifest definition does not match the assembly reference. IF I deploy directly from local visual studio to app services it's good and service is up .but If I deploy through yaml(CI/CD) there the issue . Can you please suggest on this? – mohan Aug 18 '21 at 20:08
  • @mohan I find the reason, I will update the answer, if it helps you, you can accept it as answer, thanks. – Jason Pan Aug 19 '21 at 01:21
  • Thanks much for your help and support !unfortunately this didn't work though I upgraded to 3.1.17 .Here is the error Unhandled exception. System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Extensions.Configuration.Abstractions, Version=3.1.17.0, The system cannot find the file specified. File name: 'Microsoft.Extensions.Configuration.Abstractions, Version=3.1.17.0 ,but dll is available in the www root folder – mohan Aug 19 '21 at 20:35
  • @mohan okey，please follow the code I provided in csproj, and also upgrade 3.1.17, and try again. – Jason Pan Aug 19 '21 at 22:14
  • @mohan if also failed, pls try to copy and paste the dll from the folder, you can find the path in scm site. If it works, pls use ItemGroup tag. https://stackoverflow.com/questions/67181866/azure-functions-dont-publish-appsettings-prod-json-file/67206074#67206074 . Try to modify csproj file, include.dll file when build and deploy. – Jason Pan Aug 19 '21 at 22:24
  • Thanks for all your help @Jason Pan ! much appreciated. I have ended up by creating the new app service. It's working fine. – mohan Aug 22 '21 at 22:33