Veteran Black Ops players discovered a weird but effective trick for the common_mp.ff error involving the DLC files.
Sometimes Steam's verification tool thinks the files are fine, but they are actually corrupted or zero-byte files. You need to force Steam to download fresh ones. call of duty black ops error exe cannot find-zone
Some antivirus programs (especially Avast, AVG, or Norton) quarantine .ff files. Veteran Black Ops players discovered a weird but
is present in the root folder. Some users resolve this by manually adding or replacing this file with the correct language version. Compatibility and Permissions Right-click the game's Properties > Compatibility , and check Run this program as an administrator Try running the game in compatibility mode for Windows XP SP3 Specific Repack Issues call of duty black ops error exe cannot find-zone