completely new lobby system

src/de/steamwar/lobby/listener/PlayerJoinListener.java

@@ -20,7 +20,7 @@ public class PlayerJoinListener implements Listener {
         if(LobbyPlayer.getLobbyPlayer(player.getUniqueId()) == null)
             new LobbyPlayer(player.getUniqueId());
 
-        player.teleport(new Location(Bukkit.getWorld(Config.WorldName), Config.SpawnX, Config.SpawnY, Config.SpawnZ));
+        player.teleport(new Location(Bukkit.getWorlds().get(0), Config.SpawnX, Config.SpawnY, Config.SpawnZ));
         LobbyInventory.givePlayerLobbyItems(player);
         player.setGameMode(GameMode.ADVENTURE);
         player.setHealth(20);

src/de/steamwar/lobby/listener/PlayerMoveListener.java

@@ -18,7 +18,7 @@ public class PlayerMoveListener implements Listener {
                 new Vector(Config.BorderMaxX, Config.BorderMaxY, Config.BorderMaxZ),
                 to.toVector()))
             event.getPlayer().teleport(new Location(
-                    Bukkit.getWorld(Config.WorldName),
+                    Bukkit.getWorlds().get(0),
                     Config.SpawnX,
                     Config.SpawnY,
                     Config.SpawnZ));