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Sorry, not too sure where to post this, but when i try to 'play sourcesdk' i get the following error messagebox:

MountFilesystem( 207 ) failed: SteamMountFilesystem(3988,207,0x4fffbfc=,0x4fffd0c) failed with error 116: Cache needs repair


I've tried deleting the sourcesdk.gcf file, and the folder in my username folder named 'sourcesdk' to re-download it, but i get the same error.

Any help would be greatly appreciated.
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