Railcraft server error

[Dexter545]

Title: Railcraft server error

Version: 3.1.2

OS: Mac OS X 10.7.4

Java Version: 6

Description of Problem:

Hi! I have installed tekkit 3.1.2. With railcraft 5.3.3. And I can't create coke oven bricks!! It turn up in the left corner in the crafting bench and just dissiperes, I tried to spawn it with cheat and than I got kicked from the server! It said this:

Error Messages:

Disconnected by Server

Internal server error

Error Log:

[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.(ItemStack.java:39)

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

at codechicken.nei.NEIServerPacketHandler.handleGiveItem(NEIServerPacketHandler.java:116)

at codechicken.nei.NEIServerPacketHandler.handlePacket(NEIServerPacketHandler.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_CodeChickenCore.java:65)

at net.minecraft.server.BaseMod.onPacket250Packet(BaseMod.java:93)

at cpw.mods.fml.server.FMLBukkitHandler.handlePacket250(FMLBukkitHandler.java:407)

at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1338)

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:119)

at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:83)

at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:579)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

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