MutedTetris

I apologize for putting this here, but I have looked everywhere and tried everything to fix this problem that I can think of. I run a multiplayer modded server for a friend of mine and I, and it was working perfectly fine about a month ago. But now that I've put it back up and tried to get it running, it crashes whenever someone logs on. I have tried removing mods, changing the version of forge, and numerous restarts. Here is the crash report: https://pastebin.com/W1Y1eaPk Any help would be appreciated, thank you for your time.