Every time that I load up the Black Ops 2 co op on free for all. screen goes black like it will load up and there is an error message that apears in the top right hand corner and the game freezes just stays black and the numberrs are 23.443.83 . please help
Those numbers at the top corner do not correlate to an error code. It is simply the version number of the gametype lobby.
Try deleting the Game Data for the game and re-update the game and redownload the nuketown map if you have it.
Sorry this is a bad experience for you.