world anchors disabled by default?

[OptimistEmo]

Title: world anchors disabled by default?

Version: 3.0.3/3.0.4

OS: irelivent

Java Version: 7

Description of Problem:

its not really a bug/error but i cant create world anchors. i havent played around with anything (this is in my private server)

Error Messages:

It says internal server error and disconects me

Error Log:

15:53:21 [WARNING] Failed to handle packet: java.lang.NullPointerException

java.lang.NullPointerException

        at net.minecraft.server.ItemStack.setData(ItemStack.java:153)

        at net.minecraft.server.ItemStack.<init>(ItemStack.java:39)

        at codechicken.core.PacketCustom.readItemStack(PacketCustom.java:409)

        at codechicken.nei.NEIServerPacketHandler.handleGiveItem(NEIServerPacket

Handler.java:111)

        at codechicken.nei.NEIServerPacketHandler.handlePacket(NEIServerPacketHa

ndler.java:21)

        at codechicken.core.CoreUtils.handlePacket(CoreUtils.java:150)

        at codechicken.core.PacketCustom.recieve(PacketCustom.java:451)

        at net.minecraft.server.mod_CodeChickenCore.onPacket250Received(mod_Code

ChickenCore.java:65)

        at net.minecraft.server.BaseMod.onPacket250Packet(BaseMod.java:74)

        at cpw.mods.fml.server.FMLBukkitHandler.handlePacket250(FMLBukkitHandler

.java:381)

        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1444)

        at net.minecraft.server.Packet250CustomPayload.handle(SourceFile:46)

        at net.minecraft.server.NetworkManager.b(NetworkManager.java:234)

        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:121)

        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:7

8)

        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:556)

        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:453)

        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

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