DirectX screwing all this up?

Hello guys! I literally have done nothing to my perfectly working unity project and login one time again and get this bullcrap…

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I’m going to be very mad if I lose a lot of work because of this…
The LAST thing I can think of was installing another version of DirectX. Would this be doing it? How do I make this work again?

EDIT: I just did Assets → Reimport All. Now I only get one error stating “KeyNotFoundException: The given key was not present in the dictionary.”
How can I fix this please? :cry:

Most likely: