Visual Studio 2019 stopped working with Unity 2019.1.10f1

When I open my project (only this one) in Unity 2019 I get an error saying “The application is not installed”
0 out of 4 projects. (see pic)
And I get no autocomplete or linking between scripts with F12.
Visual Studio ver: 16.2
Unity game dev tools: 4.2.0.1

I tried reinstalling visual studio it didn’t help.

Does anyone know what may cause this issue?

Help anyone?

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