To fix the "sound bank failed to load cmn-root.english" Call of Duty: Black Ops 2 , you generally need to address missing or mislabeled language files
Right-click the Speaker icon in your Windows taskbar and select Sound Settings. Click on More sound settings (or Sound Control Panel). black ops 2 sound bank failed to load cmn-root.english
If moving the language files doesn't work, try these secondary steps: To fix the "sound bank failed to load cmn-root