To fix the error, you must resolve a missing language asset conflict between your client settings and your game folder directory . This error prevents Call of Duty: Black Ops II from booting and occurs across official Steam installations as well as popular repack variants.
If verification fails, force Steam's language loop to recognize the file path: black ops 2 sound bank failed to load cmnrootenglish best
Use this only for the multiplayer and zombies. The patch is widely used, but do not run it if you intend to play ranked League Play (though that is mostly dead anyway). A quick Google search for "BO2 T7 Patch" will get you there. To fix the error, you must resolve a