Maps help plz THANKS!!!

[Mazeloki]

Ok so everytime I try to go into an avalanche or flash map it will say this

Couldn't CRC map maps/dod_avalanche.bsp disconnecting

I dont know why how do I fix this problem I would really love to play on our avalanche server

 

[ROCKET CHUMP]

http://forums.jolt.co.uk/showthread.php?threadid=464489