Beginner with multitude number of errors! Help~,Compiler errors

Hello, I obviously did something horrible, cause I now have a total of 49 CS0246 errors in the console. I have no idea whatsoever how to fix them. They are all variations of:

Library\PackageCache\com.unity.render-pipelines.universal@7.3.1\Editor\ShaderGraph\UniversalShaderGraphUtils.cs(16,108): error CS0246: The type or namespace name ‘ShaderPass’ could not be found (are you missing a using directive or an assembly reference?)

I have no idea what this means. I would like to fix this… anyway an absolute beginner can fix this? Barely can do C#, so would really struggle with a fix that requires that… Any assistance would be appreciated!,

Maybe this other thread can be helpful. I don’t know if that’s the case but worth the shot.