[2022] MOVED: 20gb error log, how do fix?

This is caused by one of your mods. Based on the errors, it looks like Dynamic UI Themes is the culprit here. Disabling that should stop the error spam.

Originally posted by o: uh.. i found a fix - create error.log folder and remove all permissions on it.

I wouldn't recommend doing this, as it would make it considerably more difficult to diagnose any issues you may have in the future.