CS0246: The type or namespace name 'NUnit' could not be found

When I upgraded from 2021.21a. to 2021b1 I get this error in the console
I have no idea how to fix it.

  • Reimported all asserts: still there
  • Deleted PackageCache folder in the library: still there

Any idea how I can fix this?
Thanks

Also running into it. Also removed the whole Library Folder, with no change. Upgraded from 2021.1.12f

Installing the test framework seems to help

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