This looks like several (!) of the mod files have been corrupted somehow... Typically file corruption will only affect one file so I'm somewhat sceptical that this actually is file corruption, but in case it is try re-downloading the server.
Problem seems to be fixed. I guess it was just a corrupted file. Its odd cause I downloaded both from the launcher and from the website for the server. Oh well, thanks! ♥ Now I just gotta fix leaking worlds.
