I keep getting this error when i try and rank a player up via zombie kills.

http://pastebin.com/v6Zx81eD

FIXED. I needed to have beta functions on on stats. I recommend that you post this some where so players know.
I only figured this out because i was looking at past error and noticed that it was a common thing.

When you login into your server, Autorank will tell you what's wrong.

Yes this is very true. But it only does this when you log on and for me who was always on the server and was just reloading you never see then message.... Also when i log in with welcome messages ect ect this can be hard to notice

I suggest that when you do the command and it says An internal error..........
It should show the message that tells you what is wrong aswell

The warning will now show every 30 seconds when you're online. This way you'll definitely see it.