As that is an EAC error you should start by trying to reinstall EAC. This also appears to be a program conflict error, thus you might want to check what programs may be conflicting with EAC to generate this error.
Also when I click the link to directly contact easy anti-cheat, the forms asks me to choose a game and darktide is not in the list. It won’t let me continue.
We’ve asked Easy Anti-Cheat to include Darktide, perhaps in the mean time you could select Vermintide 2. They should still be able to help regardless of the product selected.
Just got this error from EAC out of nowhere.
It happened on the experimental branch, -which has helped a lot regarding error 2001 btw-.
I will contact EAC support if it happens again despise my efforts to fix it.