If you have the error:


ERROR: sound bank failed to load mpl_patch.all


Please do the folllowing in order to fix it:


  • Go to Steam library and on Call of Duty Black Ops II - Multiplayer select properties then go to local files and click on "VERIFY INTEGRITY OF THE GAME CACHE"
  • Wait for Steam to download the missing files
  • Reapply the file Localization_mp  from the language patch and it will fix it