WORLDEDIT-3133 - Reported by dweSheppard

Command: //forestgen 10 birch 3.5
When I am using it without parameters the server dont crash.

Crashreport: http://pastebin.com/Da1iqx42
Serverlog: http://pastebin.com/L8TLkp7z

Comment by sk89q

How reproducible is this bug?

The error is caused by two different pieces of code accessing the world at the same time (from different threads). However, Minecraft only lets you safely do this from the same thread Minecraft is on.

WorldEdit only runs it on this main thread, so this might be caused by another plugin.

Comment by dweSheppard

Now I have test it without a plugin on my server, call AsyncWorldEdit (http://www.spigotmc.org/resources/asyncworldedit.327/)
Now the Command works fine. :)