Visual Studio 2017: A fatal error has occurred and debugging needs to be terminated

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When executing unit tests in debugging mode, I get the following error message: 

A fatal error has occurred and debugging needs to be terminated. For more 
details please see the Microsoft Help and Support web site. 
HRESULT=0x8000ffff. ErrorCode=0x0.
unit-testing
visual-studio-2017
asked on Stack Overflow Nov 3, 2017 by MovGP0

5 Answers

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So my steps to fix the issue,

1- [Preventive action] Update the Visual studio 2017 , from the yellow flag notification or from 

Tools >> Extensions & Updates >> Updates >> visual studio marketplace.

2- Search in your test solution for launchsettings.json file and remove it.

3- Clean the test solution .

4- Rebuild the project .

5- Make a cup of coffee ;).

answered on Stack Overflow Nov 16, 2017 by Ahmed Elbatt
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Restarting Visual Studio solved this issue for me.

answered on Stack Overflow Feb 3, 2020 by Akshay Khot
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Cleaning the solution didn't work for me, and I couldn't find a launchsettings.json.

What eliminated the error for me: Changing the Startup project to a project other than the test project, as mentioned in this MSDN forum post.

answered on Stack Overflow Apr 4, 2018 by System.Cats.Lol
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Solution

Clean the solution and try again. See Visual Studio Forum for details. It helped in my case.

answered on Stack Overflow Nov 3, 2017 by MovGP0 • edited Nov 16, 2017 by MovGP0
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Try to check your depencency packages and references and try to ensure that all is ok. I fix this problem delete unnecessary and broke dependencies.

answered on Stack Overflow Jun 12, 2019 by Norberto Quesada

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