Plutonium

wlrrd Were you trying to load a mod menu of some sort? If so, just delete the maps folder in Black ops 2\t6r\data

wlrrd i used this https://forum.plutonium.pw/topic/6966/how-to-use-a-mod-menu-without-injecting-loading-gsc-scripts-client-sided?_=1621416482512

i got the mod menu in C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops II\t6r\data\maps\mp\gametypes_zm and it works perfectly fine in custom matches and even your friends can join ( only host can use the menu)