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I have 2 networked apps that should send serialized protobuf-net messages to each other. I can serialize the objects and send them, however, I cannot figure out how to deserialize the received bytes . I tried to deserialize with this and it failed with a NullReferenceException. // Where "ms" is a memorystream containing the serialized // byte array from the network. Messages.BaseMessage message = ProtoBuf.Serializer.Deserialize<Messages.BaseMessage>(ms); I am passing a header before the serialized bytes that contains message type ID, which I can use in a giant switch statement to return the expected sublcass Type. With the block below, I receive the error: System.Reflection.TargetInvocationException ---> System.NullReferenceException. //Where "ms" is a memorystream and "messageType" is a //Uint16. Type t = Messages.Helper.GetMessageType(messageType); System.Reflection.MethodInfo method = typeof(ProtoBuf.Serializer).GetMethod("Deserialize").MakeGenericMethod(t); message = method.Invoke(null, new object[] { ms }) as Messages.BaseMessage; Here's the function I use to send a message over the network: internal void Send(Messages.BaseMessage message){ using (System.IO.MemoryStream ms = new System.IO.MemoryStream()){ ProtoBuf.Serializer.Serialize(ms, message); byte[] messageTypeAndLength = new byte[4]; Buffer.BlockCopy(BitConverter.GetBytes(message.messageType), 0, messageTypeAndLength, 0, 2); Buffer.BlockCopy(BitConverter.GetBytes((UInt16)ms.Length), 0, messageTypeAndLength, 2, 2); this.networkStream.Write(messageTypeAndLength); this.networkStream.Write(ms.ToArray()); } } This the class, with base class, I'm serializing: [Serializable, ProtoContract, ProtoInclude(50, typeof(BeginRequest))] abstract internal class BaseMessage { [ProtoMember(1)] abstract public UInt16 messageType { get; } } [Seriali

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