[UFF]

pawn Code:

CMD:aduty(playerid, params[])
{
    new id;

    if(IsAdmin(playerid))
    {
        if(IsOnAdminDuty(playerid))
        {
            PlayerInfo[playerid][pAdminDuty] = 0;
            SendClientMessage(playerid, COLOR_YELLOW, "You are now off duty.");
            DestroyDynamic3DTextLabel(PlayerAdminLabel[playerid]);
        }
        else
        {
            PlayerAdminLabel[playerid] = CreateDynamic3DTextLabel(ReturnAdminLevel(playerid), 0xFFA500FF, 0, 0, 0, 40.0, playerid, INVALID_VEHICLE_ID, 0, -1, -1, -1, 100.0);
            PlayerInfo[playerid][pAdminDuty] = 1;
            SendClientMessageEx(playerid, COLOR_YELLOW, "You are now on duty as a %s", ReturnAdminLevel(id));
        }
    }
    else
        return SendClientMessage(playerid, COLOR_RED, "ERROR: You are not an Administrator!");

    return 1;
}

Try this