Installing mod tools has 0 effect on the game. Must be something else, or the maps you are playing are bugged

Since this issue has started even the default maps dont work

So me and my friend play zombies most nights and he always hosts because I play on a laptop which isnt powerful enough too, anyway for the last few days we've had an issue where I can join the lobby fine but when he starts the game he goes to ready and I get stuck on loading, on his screen he h...

So I've recently started my first map and I've had an issue with the perks, everytime I try to start the game I get "unknown item zombie_bo2_perk_bottles", would appreciate some help as I'm quite new to all this stuff and dont really know what I did wrong, I followed the ste...