User Not Properly Updated During Login

As the title says. My console is getting spammed with...
[SEVERE] Player: Derp was not properly updated during login!
How do I fix it.

 

I know this is of no help to you, but i get the exact same problem. It just randomly restarts too.

 

OK Im willing to bet that you have bukkit contrib yes? and that something called sprout downloaded. Delete bukkit contrib because it is now spout

 

Just deleted BukkitContrib and all is well so far. Thanks

 

yeah it happened to me as well. but sprout downloaded when my server was being screwy ( world had a misplaced chuk ) so i just searched for it and saw every1 having the same problem. but be aware, the update breaks some plugins that rely on it so update them

 

Yep, thats Spout debugging. ignore it, Afforess forgot to took it out.

 

Sweet, thanks.