How to fix the code_pre_gfx error?
If you downloaded the game on Steam then make sure you downloaded both MP and ZM.
If you did then repair both the MP and the ZM in Steam
https://plutonium.pw/docs/repair/#the-repair-process-for-t4-t5-and-t6-steam
If you downloaded the game with the torrent then repair your game
https://plutonium.pw/docs/repair/#the-repair-process-for-t4-t5-and-t6
If you downloaded the game from another source then you can try repairing it but we recommend deleting it and getting the game from our install doc (Steam or our torrent)
https://plutonium.pw/docs/install/#t6-black-ops-2