GmodRP class flagging problem

well hello guys i have been trying to make some classes in the gmodRP gamemode admin only, i have constantly fiddled but to no avail. when i do change things all i get are HUD errors. if anyone knows how to make classes in gmodRP admin and superadmin only hit me up on steam or just post here.

i really need to get this fixed.

Why do you have a server is that what it is for?