Well thats what it say's. What might be happening here is a problem with the server files and your files. Try deleting the mod that the cod2 DM server uses.Them reload it off the server. Can a cod2 adm post what mod is used sorry I don't know. It should be here C: / local disk /user /user name /appdata /local /activision /cod2/ mods . It will be there is you have UAC turned off If you have UAC turned on I think instead of local it will be under virtualization not too sure about that though. Besides that I don't know what to tell ya except I don't have that file and I can get on that server. Some would say defrag your hard drive you might have a file outa place or clean up your registry with CC Cleaner thats up to you. You could back up your profile and maps and reload the game lots of work but its always nice to have a clean install mods and maps do have a way of screwing things up. Good luck
If your looking for files with Vista/Win7 and UAC turned on then they will be in a different location, once you get to your program files folder, look for a button at the top of your window that says "Compatability Files", hit that and it will take you to the Virtual Store folder where you will find all the map files.