Sandbox error

I recently added the achievement mod, and well, everytime i open the spawn menu, i get a error about it.
See?


I also get an error when i spawn something (as seen in image above) and a error when using the remover tool.
That error is shown here:
[media]http://i35.tinypic.com/9sxzyu.jpg

And before you say anything, this is a legal copy, not a pirate one.
Anyone got any help?

[editline]12:41PM[/editline]

this didn’t occur on multiplayer AFTER i removed the achievements mod.

I got the same error. It hasn’t affected the gameplay other than the error showing up every time I press “Q”.

There’s really not much you can do without altering the lua of the achievements mod, so it would be best just to remove it, or wait for the addon’s creators to update it.

Yeah.
I removed it and the errors went away.

[editline]08:33AM[/editline]

Thanks.