Bunch of errors in some script called "SpriteSkinUtility"

I dont know how, but I somehow broke a script that I dont know (I probably missclicked few keyboard buttons and there we go, 300 errors).

Any tip on fixing it? Maybe reinstalling it? I hope it wont delete my own scripts.

It looks like this:

Greetings @VseOdbornik

Have you previously used the Unity.Mathematics namespace and is it still there? Looks like all your errors relate to maths classes

Edit: I couldn’t find source for that module on my system but then realised it’s a package. Uninstalling and Reinstalling the Package shouldn’t cause a problem but, as always, backup first…