{HELP} SUPER KNIFE

Iv downloaded many "super knife mods" and it works but when i try to knife it dc's me out of the game and says connection lost. Well idk what happen cuz on my old computer i could use the m9 > mini gun and im on my new one and i cant?

Did anyone have this problem and fix it....please tell how and provide a link to the super knife...flamethrower, minigun ect.

Thanks You