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Most likely you have an outdated version or you're in MP while trying to join a ZM invite or vice versa

No, thats just he most common reason causing that issue.
Do you have any directx overlays enabled? Those can cause that too.

MarQuitossss we have switched to the integrated friendslist of bo2 a long time ago.

try reinstalling

Snechyy_ code_pre_gfx comes with the torrent so if it's missing either the torrent didn't finish downloading or you selected the wrong folder.

This has nothing to do with game files.
The host needs to open a port on his router
https://plutonium.pw/docs/custom-games/#t6

https://github.com/RaidMax/IW4M-Admin/wiki/FAQ#could-not-get-the-dvar-value-for-version

https://discord.gg/ZZFK5p3

AlexGamerB You need Mod Tools to do this. Currently there are No Mod Tools for BO2

The same here with a friend and myself

xHydra did you ever get your game to work the Solo zombies game loading into a multiplayer version of the map if so let me know because im having the same issue.