Netty Protostuff to Unity protobuf-net: “invalid field in source data 0”

Question

I create a java server base Netty and use Protostuff handle the data, but when I receive data in game client base unity then deserialize it, but throw an error: "invalid field in source data 0".How can I fix it?

Java Code:

private Schema<SocketModel> schema=RuntimeSchema.getSchema(SocketModel.class);
LinkedBuffer buffer = LinkedBuffer.allocate(1024);
    byte[] data = ProtobufIOUtil.toByteArray(message, schema, buffer);  
    ByteBuf buf = Unpooled.copiedBuffer(CoderUtil.IntToBytes(data.length),data); 

out.writeBytes(buf);

C# Code：

 private SocketModel DeSerial(byte[] msg)
{
    using (MemoryStream ms = new MemoryStream(msg))
    {

            SocketModel socketModel = Serializer.Deserialize<SocketModel>(ms);
            return socketModel;
    }
}