Check your game directory for a folder named _Language Switcher .
This is the most effective solution, as it tells Steam to scan your local files and replace any missing or broken files, including the cmnrootenglish sound bank. Open your . Right-click on Call of Duty: Black Ops II . Select Properties . black ops 2 sound bank failed to load cmnrootenglish link
Are you running the or a custom client like Plutonium ? Check your game directory for a folder named
Watch this guide for a visual walkthrough on verifying game files and fixing launch errors: Right-click on Call of Duty: Black Ops II
When Call of Duty: Black Ops II launches, it references a master package file containing audio assets and global text strings, often called a "sound bank" or localization depot. The suffix .english (or variations like .polish or .all ) indicates the language package the game engine is trying to pull. If the game properties dictate an English interface but the actual cmn_root file is missing, corrupted, or mismatched in the directory, the engine aborts the initialization process and throws a fatal error. Solution 1: Fix for Official Steam Users