mystic error

Hey Guys,

first big sorry for my english. Its only school english, so its not the best. Hope you can understand me.

So since I updated Craftbook to Version CraftBook v3.8.5r1 my Server regularly crashing. But the Error shows some strange answer. May you can explain me the Error? Or how to fix this?
If I use the Bukkit Beta Build 1.7.2-R0.3, the errors away.


Thanks!