Type or namespace 'hub' cannot be found error in asp.net chat application

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ASP.NET

SignalR

I am trying to run a project but I am getting this error

The type or namespace name 'Hub' could not be found (are you missing a using directive or an assembly reference?)
This is my code

using System;
       using System.Collections.Generic;
        using System.Linq;
        using System.Web;
        using Microsoft.AspNet.SignalR;

        using VirtualClassroom;

        namespace VirtualClassroom

{
    public class ChatHub : Hub
    {
        #region Data Members

        static List  .....     
        static List......
        #endregion

        #region ....       .........
      ...
     }
    }</pre>

I have uninstalled dependencies and installed current version of the signalr still I am getting this error. I searched for it a lot but no solution helped me .Please help. Exact solution would be appreciated