This happened in my console, no startup errors, but when somebody logs on.... http://pastebin.com/1Ce0za4a
What would that do? Hopefully not get rid of data. Wouldn't that just put back this error? EDIT by Moderator: merged posts, please use the edit button instead of double posting.
Move your world folder somewhere else and let your server generate a new one. If there's nor error, it means your world is corrupted.