My server keeps crashing

My server was crashing every 5 to 10 minutes so i updated to 1.4.3 R03 and it continued happening with same error. I took out all my plugins and the problem continued to happen. http://pastebin.com/AwP3GGwT There is the error.

 

31.12 17:02:15 [Server] INFO [xAuth] Attempting to use supported permissions plugin 'PermissionsEx

 

Think this is similar. You've probably got a whole bunch of some block (flowers, mushrooms, doors) that breaks when the block that's below it breaks, placed with WorldEdit or similar. The result is a chain of breakage that's too long for the server to handle. You can try the PhysicsDisabler plugin to find it and fix it. I'm curious whether it works for this, so do report back. Other people have suggested MCEdit.

EDIT: if you use PhysicsDisabler, don't do it with other people on the server, as it would allow them to create more such chains and other strange artifacts.