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Are you banned from XBL for having a modded BIOS? If so, that would be why.
Have you tried downloading it again? If that doesnt work delete it from your hardrive and download again.
Don't just delete that map pack. delete all of your map packs and reload them again. There have been about 5 posts about this problem in the past week and a half. It appears to be becoming a problem. It worked with all the others that I talked to.
Check outt his thread I just made like umm axctually a long time ago but just look at my previous posts, its in theer, its your complete solution