Source SDK error when launching

dlandis72

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Sep 27, 2004
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I have been trying to launch the SDK and it gives me this error. It says

MountFilesystem( 221 ) failed: SteamMountFilesystem(3840,221,0x33dfbfc=,0x33dfd0c failed with error 116: Cache needs repair

I have been using the program for weeks and it hasn't been giving me any problems. I even deleted the GCF file and it still didn't work when I reinstalled it. What could be the problem?
 
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