How to make a item update packet?? [FORGE][1.6.2]

I start the server side in eclipse and then the client join the server excute a keybind, that gives me a new item and I need a packet to let the server know whats going on. So I got one and it works fine for singleplayer when before it would just switch back to nothing this is the error I get when sending the packet in singleplayer or multiplayer.

2013-10-04 16:11:21 [iNFO] [sTDERR] java.io.EOFException
2013-10-04 16:11:21 [iNFO] [sTDERR] at java.io.DataInputStream.readByte(Unknown Source)
2013-10-04 16:11:21 [iNFO] [sTDERR] at JangosMods.StarWarsSimpleMod.common.network.packet.PacketItemUpdate.readData(PacketItemUpdate.java:51)
2013-10-04 16:11:21 [iNFO] [sTDERR] at JangosMods.StarWarsSimpleMod.common.network.packet.PacketSWSMJ.readPopulate(PacketSWSMJ.java:44)
2013-10-04 16:11:21 [iNFO] [sTDERR] at JangosMods.StarWarsSimpleMod.common.network.PacketTypeHandler.buildPacket(PacketTypeHandler.java:44)
2013-10-04 16:11:21 [iNFO] [sTDERR] at JangosMods.StarWarsSimpleMod.common.network.PacketHandler.onPacketData(PacketHandler.java:25)
2013-10-04 16:11:21 [iNFO] [sTDERR] at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
2013-10-04 16:11:21 [iNFO] [sTDERR] at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
2013-10-04 16:11:21 [iNFO] [sTDERR] at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:84)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.network.NetServerHandler.handleCustomPayload(NetServerHandler.java:1111)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.network.packet.Packet250CustomPayload.processPacket(Packet250CustomPayload.java:70)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.network.MemoryConnection.processReadPackets(MemoryConnection.java:89)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.network.NetServerHandler.networkTick(NetServerHandler.java:141)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.network.NetworkListenThread.networkTick(NetworkListenThread.java:54)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.server.integrated.IntegratedServerListenThread.networkTick(IntegratedServerListenThread.java:109)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:689)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:585)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:129)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
2013-10-04 16:11:21 [iNFO] [sTDERR] at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)

This is the packet handler

public class PacketHandler implements IPacketHandler {

@Override
public void onPacketData(INetworkManager manager, Packet250CustomPayload packet, Player player) {
     // Build a PacketEE object from the data contained within the Packet250CustomPayload packet
     PacketSWSMJ packetEE = PacketTypeHandler.buildPacket(packet.data);
     // Execute the appropriate actions based on the PacketEE type
     packetEE.execute(manager, player);
    
if (packet.data != null && packet.data.length == 1 && packet.data[0] == 2) {
ArrayList<ItemStack> itemListToSend = new ArrayList<ItemStack>();
EntityPlayerMP thePlayer = (EntityPlayerMP) player;
thePlayer.inventory.setInventorySlotContents(Minecraft.getMinecraft().thePlayer.inventory.currentItem, new ItemStack(modItems.lightsaberON.itemID, 1, (Minecraft.getMinecraft().thePlayer.inventory.getStackInSlot(Minecraft.getMinecraft().thePlayer.inventory.currentItem).getItemDamage())));
for (int i = 0; i < thePlayer.openContainer.inventorySlots.size(); ++i) {
itemListToSend.add(((Slot) thePlayer.openContainer.inventorySlots.get(i)).getStack());
            
}
thePlayer.sendContainerAndContentsToPlayer(thePlayer.openContainer, itemListToSend);
}

if (packet.data != null && packet.data.length == 1 && packet.data[0] == 1) {
ArrayList<ItemStack> itemListToSend = new ArrayList<ItemStack>();
EntityPlayerMP thePlayer = (EntityPlayerMP) player;
thePlayer.inventory.setInventorySlotContents(Minecraft.getMinecraft().thePlayer.inventory.currentItem, new ItemStack(modItems.lightsaber.itemID, 1, (Minecraft.getMinecraft().thePlayer.inventory.getStackInSlot(Minecraft.getMinecraft().thePlayer.inventory.currentItem).getItemDamage())));
for (int i = 0; i < thePlayer.openContainer.inventorySlots.size(); ++i) {
itemListToSend.add(((Slot) thePlayer.openContainer.inventorySlots.get(i)).getStack());
            
}
thePlayer.sendContainerAndContentsToPlayer(thePlayer.openContainer, itemListToSend);
}
}
}

The code that sends the packet

@Override
public void doKeyBindingAction(EntityPlayer thePlayer, ItemStack itemStack, String keyBinding)
{
int CurrentItem = Minecraft.getMinecraft().thePlayer.inventory.currentItem;
ItemStack ItemInHand = Minecraft.getMinecraft().thePlayer.inventory.getStackInSlot(CurrentItem);
    
if (keyBinding.equals(ConfigurationSettings.LIGHTSABER_ONOFF))
{
PacketDispatcher.sendPacketToServer(new Packet250CustomPayload(Reference.CHANNEL_NAME, new byte[] { 2 }));
     }


    

}

Server side error

[sEVERE] Encountered an unexpected exception AbstractMethodError
java.lang.AbstractMethodError: JangosMods.StarWarsSimpleMod.common.Items.ItemLightsaber.doKeyBindingAction(Lnet/minecraft/entity/player/EntityPlayer;Lnet/minecraft/item/ItemStack;Ljava/lang/String;)V
at JangosMods.StarWarsSimpleMod.common.network.packet.PacketKeyPressed.execute(PacketKeyPressed.java:48)
at JangosMods.StarWarsSimpleMod.common.network.PacketHandler.onPacketData(PacketHandler.java:28)
at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:84)
at net.minecraft.network.NetServerHandler.handleCustomPayload(NetServerHandler.java:1111)
at net.minecraft.network.packet.Packet250CustomPayload.processPacket(Packet250CustomPayload.java:70)
at net.minecraft.network.TcpConnection.processReadPackets(TcpConnection.java:462)
at net.minecraft.network.NetServerHandler.networkTick(NetServerHandler.java:141)
at net.minecraft.network.NetworkListenThread.networkTick(NetworkListenThread.java:54)
at net.minecraft.server.dedicated.DedicatedServerListenThread.networkTick(DedicatedServerListenThread.java:34)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:689)
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:275)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:585)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)

any ideas?