09:41 AM [SEVERE] java.lang.NoSuchMethodError: net.minecraft.server.InventoryPlayer.j()Lnet/minecraft/server/ItemStack;
 09:41 AM [SEVERE] at org.bukkitcontrib.ContribNetServerHandler.a(ContribNetServerHandler.java:178)
 09:41 AM [SEVERE] at net.minecraft.server.Packet102WindowClick.a(SourceFile:28)
 09:41 AM [SEVERE] at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
 09:41 AM [SEVERE] at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:92)
 09:41 AM [SEVERE] at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
 09:41 AM [SEVERE] at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:464)
 09:41 AM [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:374)
 09:41 AM [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
 09:41 AM [SEVERE] Unexpected exception