Source SDK - No choises in the "Current game" box

Hey, i was working on this RP map for Garry’s Mod for the past few months, everything was running fine, but yesterday when i started up Source SDK, i couldn’t start up hammer and there were no choises in that drop0down menu that said ‘current game’ beside it. now i can’t make my map. can someone help?

I don’t use forums much, so if i’m doing something wrong here, please tell me instead of flaming. :\

EDIT fixed. thanks, Firegot522! :smiley:

Press reset game configurations in the source sdk.

Since you asked, a few of us prefer questions like these inside of the question mega threads, either the sticky or the thread I made.