Can't open menu or see custom models in MP

Okay well my friend is having a problem where he cant open the menu on my server or view custom models. Airvehicles mod is a perfect example. He cant see the fuselage of the AH-6 littlebird but he can see both rotors perfectly fine. He also gets LUA errors when he tries to open the menu. The only mods he has are Scars, Airvehicles, GM_bigcity and Atomic (Well they goes in addons so…)

I would greatly appreciate help.