[Mo3taz]

symbol "zp_zombie_class_textadd" is undefined
you have to define it
post your zombieplague include
or try this one:

public zp_zombie_class_selected_pre(id, classid)
{
	if(classid == g_lockerz)
	{
		if(zv_get_user_flags(id))
			//zp_zombie_class_textadd("\y[Lock Human Weapon > G]")
			ChatColor(id, "[Lock Human Weapon > G]")
		else
		{
			//zp_zombie_class_textadd("\r[Access Denied (VIP Only)]")
			ChatColor(id, "[Access Denied (VIP Only)]")
			return ZP_PLUGIN_HANDLED
		}
	}
	return PLUGIN_CONTINUE
}