Server Error: yh: the save is being accessed from another location aboring

[LegendaryChakratic]

http://pastebin.com/rxKVf4df

Error, I don't know what's the problem. I'm using port 25555, everything's okay. No other server is accessing the same world unless I'm not informed by my own computer well enough ¬_¬.

Plugins that might be the cause, maybe? I don't know:

ClearLag, PermissionsEx, PTweaks, WorldEdit, WorldGuard.

I got more but I think this might be the only interest.