This is what Google has for a definition:
Black ops 2 buried ERROR: exceeded maximum amount of anim info. I was in the middle of a world record tun on buried at round 70, when my screen went black and went to the black ops 2 main menu of zombies. I then got a message saying error: exceeded maximum amount of anim info.
From the way it sounds, there may have been too many Zombies spawned at the same time for the system to handle. Thats just my guess though.