I have added all the waw  guns and made sure they are in the mapname-maps folder but when i load the game andtype in devmap nazi_zombie_mapname it says:

server script compile error
bad syntax
include weapons( "weapon_kar98k" );

It should be include_weapon but I'm guessing g that's not your problem since it would say unknown method if your script actually looked like that. Go to that line in your dlc3_code and the line above it will most likely be missing a ; after it

checked but the code is fine no missing  ;