Plutonium

I get this error when I try to launch T6 Multiplayer, when I only have T6 Zombies installed. Zombies and MP are separate installations (at least on steam), so if you're trying to play Black ops 2 multiplayer, make sure that's installed. If you're trying to play zombies, you need to select "T6 Zombies" from left-side menu in in Plutonium