ComputerCraft cause internal error?

[TheDestroyer2101]

Title: ComputerCraft cause internal error?

Version: 3.1.2

OS: Ubuntu - server side

Java Version: Unknown

Description of Problem:

Whenever a player tries to craft or spawn a central processing unit, the game crashes and says 'Internal Server Error'. I cannot see any relevant error logs, but i am inexperienced so I will post it anyway.

Error Messages:

Internal Server Error

Error Log:

11.10 03:39:58 [server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

11.10 03:39:58 [server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)

11.10 03:39:58 [server] INFO at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:579)

11.10 03:39:58 [server] INFO at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:83)

11.10 03:39:58 [server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:119)

11.10 03:39:58 [server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:234)

11.10 03:39:58 [server] INFO at net.minecraft.server.Packet250CustomPayload.handle(SourceFile:46)

11.10 03:39:58 [server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1338)

11.10 03:39:58 [server] INFO at cpw.mods.fml.server.FMLBukkitHandler.handlePacket250(FMLBukkitHandler.java:407)

11.10 03:39:58 [server] INFO at net.minecraft.server.BaseMod.onPacket250Packet(BaseMod.java:93)

11.10 03:39:58 [server] INFO at net.minecraft.server.mod_CodeChickenCore.onPacket250Received(mod_CodeChickenCore.java:65)

11.10 03:39:58 [server] INFO at codechicken.core.PacketCustom.recieve(PacketCustom.java:451)

11.10 03:39:58 [server] INFO at codechicken.core.CoreUtils.handlePacket(CoreUtils.java:150)

11.10 03:39:58 [server] INFO at codechicken.nei.NEIServerPacketHandler.handlePacket(NEIServerPacketHandler.java:21)

11.10 03:39:58 [server] INFO at codechicken.nei.NEIServerPacketHandler.handleGiveItem(NEIServerPacketHandler.java:116)

11.10 03:39:58 [server] INFO at codechicken.core.PacketCustom.readItemStack(PacketCustom.java:409)

11.10 03:39:58 [server] INFO at net.minecraft.server.ItemStack.<init>(ItemStack.java:39)

11.10 03:39:58 [server] INFO at net.minecraft.server.ItemStack.setData(ItemStack.java:153)

11.10 03:39:58 [server] INFO java.lang.NullPointerException

11.10 03:39:58 [server] WARNING Failed to handle packet: java.lang.NullPointerException

[Backplague]

The central processing unit is from RP2, not CC. Also please post the full error log. Try to find out what Java the server uses. If possible, get Java 7 on it.