signalr server hub error - signalr

Question

I'm trying to create a server and a asp.net client (2 projects in one solution..).
In the server in the class where the hub is defined i get an error ...
I use visual studio 2013.
this is the startup:
using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;
[assembly: OwinStartup(typeof(TestServer.Startup))]
namespace TestServer
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
// Any connection or hub wire up and configuration should go here
app.MapSignalR();
}
}
}
the hub:
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR;
using Microsoft.AspNet.SignalR.Hubs;
namespace TestServer
{
[HubName("ServerHub")]
class ServerHub : Hub
{
public void Send(string message)
{
Clients.All.AddMessage(message);
}
}
}
it marks Clients.All.AddMessage(message) as an error : "One or more types required to compile a dynamic expression cannot be found. Are you missing a reference?" I can't understand what reference is missing.

Answer 1

You need to include the Microsoft.CSharp library.
It's easy to do, under the Add Reference dialog go to the Assemblies -> Framework tab. You'll see Microsoft.CSharp listed, add it.
Hope this helps!