tpx command

[20:55:52] [Server thread/ERROR]: Couldn't process command: 'tpx 0'
java.lang.NoSuchMethodError: net.minecraft.server.management.ServerConfigurationManager.func_72361_f(Ljava/lang/String;)Lnet/minecraft/entity/player/EntityPlayerMP;
	at com.xcompwiz.mystcraft.command.CommandMyst.getTargetPlayer(CommandMyst.java:24) ~[CommandMyst.class:?]
	at com.xcompwiz.mystcraft.command.CommandTPX.getLinkInfoForTarget(CommandTPX.java:109) ~[CommandTPX.class:?]
	at com.xcompwiz.mystcraft.command.CommandTPX.func_71515_b(CommandTPX.java:94) ~[CommandTPX.class:?]
	at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:94) [z.class:?]
	at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:734) [nh.class:?]
	at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:713) [nh.class:?]
	at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:37) [ir.class:?]
	at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:9) [ir.class:?]
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) [ej.class:?]
	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111) [bsx.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [?:?]
[20:55:52] [Client thread/INFO]: [CHAT] An unknown error occurred while attempting to perform this command