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Try launching the modpack without Twitch (video on how to do so in the Logs -> Twitch Launcher section of my signature below, just expand the spoilers)

GOSH MAYBE THERE'S A METHOD CALLED "getPrivateValue" IN THE CLASS. HAVE YOU TRIED READING THE AVAILABLE METHODS?

IPacket is a vanilla class, do not use it. SimpleChannel no longer requires your packets to implement a certain interface. Instead you need to supply the following things: An encoder (BiConsumer<MSG, PacketBuffer>). This will be called with your packet instance and a PacketBuffer to write the packet data to the byte stream. This used to be toBytes in IMessage. A decoder (Function<PacketBuffer, MSG>). This will be called with the byte stream data and must decode it into an instance of your packet. This used to be done via a reflective constructor call and fromBytes. A handler (BiConsumer<MSG, Supplier<NetworkEvent.Context>>). This will be called to handle your message. This used to be IMessageHandler. Using method references for these makes your packet code very clean: class MyPacket { private final int data; MyPacket(PacketBuffer buf) { this.data = buf.readInt(); } MyPacket(int data) { this.data = data; } void encode(PacketBuffer buf) { buf.writeInt(data); } void handle(Supplier<NetworkEvent.Context> context) { } } channel.registerMessage(0, MyPacket.class, MyPacket::encode, MyPacket::new, MyPacket::handle);