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Testhost process exited with error

1 minutes
January 1, 2020
[ dotnet ]

I have a new machine. So, I’ve been installing all the things.

I’ve been bringing a dotnet project up to date. First step was some tidying and making sure the tests pass. But I’ve been getting these…

The error

Turns out I hadn’t actually installed all the things. I had installed Visual Studio 2019 (16.4) which gives you 2.1 and 3.1. But not 2.2. So off I went and installed 2.2. But only the x64 version. This was the problem… after some googling I can across this Testhost .NET Error (goto the first “Solution”) and the answer is to default the test runner to x64 as follows…

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