This error is notoriously common across Steam, Plutonium (the popular third-party client), and even disc-based versions of the game. It effectively prevents you from launching the campaign, multiplayer, or zombies mode. The game hangs, crashes to desktop, or loops endlessly on a loading screen.
Essential pointers in the game's configuration files may have been altered by a crash or a forced shutdown. Solutions and Fixes Verify Integrity of Game Files Right-click Black Ops 2 in your Steam Library. Select Properties > Installed Files . black ops 2 sound bank failed to load cmnrootenglish link
