It means the game is broken. It has been happening to alot of people the last few weeks. Lots of threads on error code 4096 have been popping up in the community and they have not done anything to fix it.
If I'm not mistaken that is the code that you get when you can't get connected to the COD server. That has been going around a lot lately. Generally though you can reboot your console and that will get you playing again.