addentities.lua donator problem

AddEntity("Emerald Printer", {
	ent = "emerald_money_printer",
	model = "models/props_c17/consolebox01a.mdl",
	price = 2500,
	max = 2,
	cmd = "/buyemerald"
        customCheck = function(ply)
             return ply:IsUserGroup("donator")
        end
})

AddEntity("Ruby Printer", {
	ent = "ruby_money_printer",
	model = "models/props_c17/consolebox01a.mdl",
	price = 5000,
	max = 2,
	cmd = "/buyruby"
        customCheck = function(ply)
             return ply:IsUserGroup("donator")
        end
})

AddEntity("Sapphire Printer", {
	ent = "sapphire_money_printer",
	model = "models/props_c17/consolebox01a.mdl",
	price = 7500,
	max = 2,
	cmd = "/buysapphire"
        customCheck = function(ply)
             return ply:IsUserGroup("donator")
        end
})