Invalid Game folder?

[j3i)1_/\/\4574]

I get an error message about 90% of the time when trying to join an MP game saying 'invalid game folder.' Does anyone know what the problem is, and how I can fix it? I have managed to join a couple of times, but the vast majority I get this error.

 

Thanks in advance.

[j3i)1_/\/\4574]

bump

[teleguy]

http://www.lucasforums.com/showthread.php?s=&threadid=46249