how can i push message between server and client in namedPipeWrapper?

I wrote the client and server side based on the documentation Named Pipe Wrapper, but unfortunately only server.ClientConnected runs and server.ClientMessage and client.ServerMessage do not run. How can I push a message from the client to the server And vice versa?

model :

[Serializable]
public class SomeClass
{
    public string Request { get; set; }
    public string Response { get; set; }
}

client side :

var client = new NamedPipeClient<SomeClass>("MyServerPipe");

        client.ServerMessage += delegate (NamedPipeConnection<SomeClass, SomeClass> conn, SomeClass message)
        {
            Console.WriteLine("Server says: {0}", message.Response);
        };

        // Start up the client asynchronously and connect to the specified server pipe.
        // This method will return immediately while the client runs in a separate background thread.
        client.Start();
        Console.ReadKey();

server side:

 var server = new NamedPipeServer<SomeClass>("MyServerPipe");

        server.ClientConnected += delegate (NamedPipeConnection<SomeClass, SomeClass> conn)
        {
            Console.WriteLine("Client {0} is now connected!", conn.Id);
            conn.PushMessage(new SomeClass { Response= "Welcome!" });
        };

        server.ClientMessage += delegate (NamedPipeConnection<SomeClass, SomeClass> conn, SomeClass message)
        {
            Console.WriteLine("Client {0} says: {1}", conn.Id, message.Request);
        };

        // Start up the server asynchronously and begin listening for connections.
        // This method will return immediately while the server runs in a separate background thread.
        server.Start();
        Console.ReadKey();