My Packet class:

public class PacketRequestData<T extends TileEntity & ITileNetworkable> implements IMessage {
	public PacketRequestData() {

        }

	public PacketRequestData(T tileEntity) {
		super(new BlockLocation(tileEntity));
	}

	public PacketRequestData(ITileComponent tileComponent) {
		super(new BlockLocation(tileComponent.getTileEntity()));
	}

	@Override
	public void fromBytes(ByteBuf dataStream) {

	}

	@Override
	public void toBytes(ByteBuf dataStream) {

	}

	public class PacketRequestDataMessage implements IMessageHandler<PacketRequestData, IMessage> {
		@Override
		public IMessage onMessage(PacketRequestData message, MessageContext messageContext) {
			TileEntity tileEntity = message.getBlockLocation().getTileEntity(PacketHandler.getWorld(messageContext));

			if (tileEntity != null && tileEntity instanceof ITileNetworkable) {
				//return new PacketTileEntity((T) tileEntity);
			}

			return null;
		}
	}
}


Registers this with:
public class PacketHandler {
	private static final SimpleNetworkWrapper network = NetworkRegistry.INSTANCE.newSimpleChannel("mymod");

	static {
		// Register packets.
		network.registerMessage(PacketRequestData.PacketRequestDataMessage.class, PacketRequestData.class, 0, Side.SERVER);
	}
}

I get this errors, this is somehow related to general types:
Error:(33, 24) java: no suitable method found for registerMessage(java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData.PacketRequestDataMessage>,java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData>,int,cpw.mods.fml.relauncher.Side)
    method cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.<REQ,REPLY>registerMessage(java.lang.Class<? extends cpw.mods.fml.common.network.simpleimpl.IMessageHandler<REQ,REPLY>>,java.lang.Class<REQ>,int,cpw.mods.fml.relauncher.Side) is not applicable
      (cannot infer type-variable(s) REQ,REPLY
        (argument mismatch; java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData.PacketRequestDataMessage> cannot be converted to java.lang.Class<? extends cpw.mods.fml.common.network.simpleimpl.IMessageHandler<REQ,REPLY>>))
    method cpw.mods.fml.common.network.simpleimpl.SimpleNetworkWrapper.<REQ,REPLY>registerMessage(cpw.mods.fml.common.network.simpleimpl.IMessageHandler<? super REQ,? extends REPLY>,java.lang.Class<REQ>,int,cpw.mods.fml.relauncher.Side) is not applicable
      (cannot infer type-variable(s) REQ,REPLY
        (argument mismatch; java.lang.Class<org.halvors.electrometrics.common.network.PacketRequestData.PacketRequestDataMessage> cannot be converted to cpw.mods.fml.common.network.simpleimpl.IMessageHandler<? super REQ,? extends REPLY>))