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java.lang.NullPointerException: 



    at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:956)

    at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)

    at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)

    at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1967)

    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)

    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)

    at net.minecraft.client.main.Main.main(SourceFile:101)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(-2)

    at sun.reflect.NativeMethodAccessorImpl.invoke(-1)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(-1)

    at java.lang.reflect.Method.invoke(-1)

    at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)

    at net.minecraft.launchwrapper.Launch.main(Launch.java:27)