@IvanBO2 well are you using your Steam files? If yes do you own the BO2 DLCs? If no then did you install the BO2 DLCs another way? If no then the game obviously cannot load files you don't have installed.
Follow this guide https://plutonium.pw/docs/install/#installing-t6-dlc
If you're using the torrent version instead then repairing the game could help https://plutonium.pw/docs/repair/
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