NullReferenceException' in Microsoft.TestPlatform.CommunicationUtilities.dll

Matt Ortiz 1 Reputation point
2021-07-01T17:34:46.353+00:00

VS2017
Once I open a project and run 111038-debug-log.txtDebug Unit Tests, the next time I run it, I get NullReferenceException' in Microsoft.TestPlatform.CommunicationUtilities.dll exception and can't run any more Debug Unit Tests.
Build/Run Debug Log is attached.

System Info:
Microsoft Visual Studio Professional 2017
Version 15.9.36
VisualStudio.15.Release/15.9.36+28307.1525
Microsoft .NET Framework
Version 4.8.04084

Installed Version: Professional

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  1. PengGe-MSFT 3,336 Reputation points
    2021-07-02T05:44:55.773+00:00

    Hi, @Matt Ortiz

    Welcome to Microsoft Q&A!

    So you mean that you could run unit tests before, but you can’t run them now? Or do you mean that you have not been able to run unit tests?

    According to the log you uploaded, I found this information:

    Exception thrown:'System.NullReferenceException' in Microsoft.TestPlatform.CommunicationUtilities.dll  
    Object reference not set to an instance of an object.  
    

    Please make sure that the dll file referenced by your project exists.
    Regarding NullReferenceException, you can refer to this document.

    Can you provide more detailed information? For example, screenshots of run Exception.

    Sincerely,
    Peng
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