Could not load file or assembly 'Microsoft.CodeAnalysis.LiveUnitTesting.Runtime, version= 1.7.0.0' with visual studio 2017

Question

I started live unit testing with visual studio 2017 (15.7.1). After I switch the branch and start the project, an error message comes up saying the following:

Could not load file or assembly 'Microsoft.CodeAnalysis.LiveUnitTesting.Runtime, version= 1.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependenc

I tried to:
- rebuild/restart the project
- stop live unit testing
but it didn't work.

I don't know why load 'Microsoft.CodeAnalysis.LiveUnitTesting.Runtime' from project/bin.
Anyone have a suggestion?

Answer 1

Finally, I stop live unit test and delete Persisted Data. It works now.

Step 1. Stop unit test

Step 2. Test → Live Testing → Options...

Step 3. delete Persisted Data

Step 4. Delete all folder under package folder, and then re-build Solution, it works.

hm... I still don't know why load from project/bin after changing branch :S.

Answer 2

I had the same error with VS2019, in an existing Project with unit tests working with my colleagues. I ended up updating Visual Studio to version 16.2.3, and its working now.