Solved My server keeps crashing with this error

My servers keeps crashing with the following error:

http://pastebin.com/d5E0BbD9

Plugins:


Anyone?

Solved:

Someone with worldedit spawned a massive pyramid of sapplings,
I went to the coördinates in the error but first did /stoplag and found this:

I world editted it out and this solved it....

EDIT by Moderator: merged posts, please use the edit button instead of double posting.