Believe me that the problem is being looked into. Unfortunately we are unable to find a commonality with this issue since no one seems willing to post the information requested: http://forums.aeriagames.com/viewtopic.php?t=468261.
Heck I've yet to even see a screenshot of this error.
That said, this was a problem for some in CB as well and we have yet to find a solution. It's not on the gameguard forums as an error.
The only thought I have is somehow GameGuard, or it's common files have corrupted. You may need to remove it, so it can be re-downloaded. To do this, delete the GameGuard folder from your WolfTeam Client Installed Folder (C:/Program Files/WolfTeam)
* Open Windows Explorer.
* Navigate to your WT Installed Folder.
* Delete the GameGuard folder, and it's entire contents.
* Do NOT delete the "GameGuard.des" file in the WT installed folder as it's required to run GameGuard.
The next time you launch WolfTeam, GameGuard will have to redownload (32+ updates).
Give it a try and reply back please.