Vpac error

2012-12-06 13:00:40 [INFO] Bitchstewy issued server command: /v e
2012-12-06 13:00:41 [WARNING] Failed to handle packet for Bitchstewy/127.0.0.1: java.lang.NullPointerException
java.lang.NullPointerException
    at net.minecraft.server.ContainerEnchantTable.b(ContainerEnchantTable.java:195)
    at net.minecraft.server.EntityPlayer.k(EntityPlayer.java:587)
    at net.minecraft.server.NetServerHandler.handleContainerClose(NetServerHandler.java:1194)
    at net.minecraft.server.Packet101CloseWindow.handle(SourceFile:17)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
    at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
    at net.minecraft.server.ServerConnection.b(SourceFile:39)
    at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
2012-12-06 13:00:41 [SEVERE] java.lang.NullPointerException
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.ContainerEnchantTable.b(ContainerEnchantTable.java:195)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.EntityHuman.die(EntityHuman.java:872)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.World.kill(World.java:961)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.ServerConfigurationManagerAbstract.disconnect(ServerConfigurationManagerAbstract.java:207)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:167)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.ServerConnection.b(SourceFile:46)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
2012-12-06 13:00:41 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
2012-12-06 13:00:41 [SEVERE] Encountered an unexpected exception NullPointerException
java.lang.NullPointerException
    at net.minecraft.server.ContainerEnchantTable.b(ContainerEnchantTable.java:195)
    at net.minecraft.server.EntityHuman.die(EntityHuman.java:872)
    at net.minecraft.server.World.kill(World.java:961)
    at net.minecraft.server.ServerConfigurationManagerAbstract.disconnect(ServerConfigurationManagerAbstract.java:207)
    at net.minecraft.server.NetServerHandler.disconnect(NetServerHandler.java:167)
    at net.minecraft.server.ServerConnection.b(SourceFile:46)
    at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)