ERROR on WMD map load

Hey,
I keep getting an error saying
"fastfile for zone 'mp_russianbase' is corrupt or unreadable."
only WMD map so i've found.

How do I fix this problem?
I am a PS3 user.

I have an image of the problem

http://i54.tinypic.com/2ibj22e.jpg


Please help me.
Cheers