The Problem occured after trying to restart the 1.6.4 Direwolf20 1.0.12 server, it crashed instantly every time. Also upgrading to 1.0.14 didn't change anything.
http://pastebin.com/raw.php?i=vhicPcEP
That's the crash report
Running the server on a root server with Ubuntu Linux 12.04.2 and...