Everytime I get into ANY server, including my own, on that map, I get booted to the main menu and get this error:
Jeez, quit bumping the damn thread. It's annoying.
Did you try Google?
It sounds to me like your computer is having problems running the map. Either that or you've gotten a dud copy from somewhere. But those are just offhand guesses, I haven't had to deal with that problem in a long time.
I don't know how, and I don't know why, but this is totally Sheep's fault.