How do I fix this compiler error

I get this error everytime I open my project:

Library\PackageCache\com.unity.test-framework@1.1.29\UnityEngine.TestRunner\NUnitExtensions\Commands\EnumerableTestMethodCommand.cs(33,54): error CS0246: The type or namespace name 'TestEnumeratorWrapper' could not be found (are you missing a using directive or an assembly reference?)

have been working on this project for awhile, and this is the first time this has happened. I opened it in safe mode but cant figure out the issue. When I exit safe mode and my editor opens, all my materials are pink and I have the errors still. Also if I try to bypass safe mode i get more errors. Please someone help me!