public void enableServiceMode(Player player)
   {
      if(null != player)
      {
         if(!playersInSM.contains(player.getName()))
         {
            playersInSM.add(player.getName());

            if(player.isOnline())
            {
               player.sendMessage(ChatColor.GREEN + "Service-Modus AKTIV");
            }
         }
      }
   }