Owin.IAppBuilder does not contain a definition for 'MapSignalR' error in asp.net

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ASP.NET

SignalR

OWIN

I am getting this error


'Owin.IAppBuilder' does not contain a definition for 'MapSignalR' and no extension method 'MapSignalR' accepting a first argument of type 'Owin.IAppBuilder' could be found (are you missing a using directive or an assembly reference?)
This is my code

using System;
 using System.Threading.Tasks;
 using Microsoft.Owin;
 using Owin;
<pre lang="cs">[assembly: OwinStartup(typeof(VirtualClassroom.Startup1))]
      namespace VirtualClassroom
    {
        public class Startup1
           {
              public void Configuration(IAppBuilder app)
                  {
                       app.MapSignalR();

                  }
           }
  }


    I searched a lot and tried as per stack overflow answer
   http://stackoverflow.com/questions/23057459/owin-iappbuilder-does-not-contain-a-definition-for-mapsignalr I had 

  1.Added Microsoft.Owin //version 2.0.1

  2.Added Microsoft.Owin.Security //version 2.0.1

  3.Added Microsoft Asp.Net SignalR 
 
But still I am getting the same error. Please help. Thanks in advance!!