Fehler 2

[INFO] sorol issued server command: /port notch
2013-01-02 13:04:24 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'port' in plugin Port v1.0
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
	at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:510)
	at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:980)
	at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:898)
	at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:853)
	at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
	at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
	at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
	at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
	at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
	at me.MysteryCraft.Port.Main.onCommand(Main.java:52)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
	... 15 more