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problem with packets


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hey guys,

I'm trying to send a packet from client to server but i cant get it to work :(

So, thats my code


public static SimpleNetworkWrapper network; 

public static void preInit(FMLPreInitializationEvent event) {
	network= NetworkRegistry.INSTANCE.newSimpleChannel(modid);
	network.registerMessage(MessageHandler.class, Message.class, 0, Side.SERVER); 

public class MessageHandler implements IMessageHandler<Message, IMessage> {

    public IMessage onMessage(Message message, MessageContext ctx) {
        return null;


public class Message implements IMessage{
    public int x;

    public Message() {}

    public Message(int a) {
        this.x = a;

    public void toBytes(ByteBuf buf) {

    public void fromBytes(ByteBuf buf) {
        this.x= buf.readInt();



It's crashing on startup


[15:40:50] [Client thread/ERROR] [FML]: Fatal errors were detected during the transition from PREINITIALIZATION to INITIALIZATION. Loading cannot continue

[15:40:50] [Client thread/ERROR] [FML]:

mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized

FML{} [Forge Mod Loader] (forgeSrc-1.7.2- Unloaded->Constructed->Pre-initialized

Forge{} [Minecraft Forge] (forgeSrc-1.7.2- Unloaded->Constructed->Pre-initialized

FM{ALPHA 1.0} [XY] (bin) Unloaded->Constructed->Errored

[15:40:50] [Client thread/ERROR] [FML]: The following problems were captured during this phase

[15:40:50] [Client thread/ERROR] [FML]: Caught exception from XY

java.lang.IllegalStateException: cannot determine the type of the type parameter 'REQ': class cpw.mods.fml.common.network.simpleimpl.SimpleChannelHandlerWrapper

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