I have narrowed the issue down to a problem with Extra Utilities and the latest build of Tinkers Construct / Mantle. If I do not put Extra Utilities on the server, the server starts up with no problems. If I put Extra Utilities on the server, the above crash happens.
http://pastebin.com/xSyyJ4Nk
I have narrowed the issue down to a problem with Extra Utilities and the latest build of Tinkers Construct / Mantle. If I do not put Extra Utilities on the server, the server starts up with no problems. If I put Extra Utilities on the server, the above crash happens.