Visual Studio Live Testing - Start failed because TestPlatform V2 can not be located

No matter what I do, I can't seem to get live testing to start in Visual studio 2017 (15.3.5)

I get this error: Start failed because TestPlatform V2 can not be located. Please try to modify your Visual Studio installation through Microsoft Visual Studio Installer, and make sure Testing tools core features is selected under Individual components -> Debugging and testing [13:23:22.396 Info] For more information, see http://ift.tt/2wlTCbm.

I have installed the required component and it still won't run. Although the tests will run if I manually run them.

Any help is appreciated.