Problem Server generating massive amount of errors (Ultimate)

[Infoturtle]

Ive been running a server for a couple of friends and its become unconnectable now when anyone tries to connect it gives these errors
http://pastebin.com/qPFHiRSW
I am running the ultimate pack and it is happening in the twilight forest mod

 

[supernerdyharry]

Did any one use any of the mystcraft pages because there are a few that are very unstable and can corrupt the world