SignalR cannot read property client of undefined

I'm trying to add SignalR to my project (ASPNET MVC 4). But I can't make it work.

In the below image you can see the error I'm receiving. I've read a lot of stackoverflow posts but none of them is resolving my issue.

This is what I did so far:

1) Ran Install-Package Microsoft.AspNet.SignalR -Pre
2) Added RouteTable.Routes.MapHubs(); in Global.asax.cs Application_Start()
3) If I go to http://localhost:9096/Gdp.IServer.Web/signalr/hubs I can see the file content
4) Added <modules runAllManagedModulesForAllRequests="true"/> to Web.Config
5) Created folder Hubs in the root of the MVC application
6) Moved jquery and signalR scripts to /Scripts/lib folder (I'm not using jquery 1.6.4, I'm using the latest)

This is my Index.cshtml

<h2>List of Messages</h2>

<div class="container">
    <input type="text" id="message" />
    <input type="button" id="sendmessage" value="Send" />
    <input type="hidden" id="displayname" />
    <ul id="discussion">
    </ul>
</div>

@section pageScripts
{
    <!--Reference the SignalR library. -->
    <script src="@Url.Content("~/Scripts/jquery.signalR-1.0.0-rc1.min.js")" type="text/javascript"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script type="text/javascript" src="~/signalr/hubs"></script>
    <script src="@Url.Content("~/Scripts/map.js")" type="text/javascript"></script>
}

This is my IServerHub.cs file (located inside Hubs folder)

namespace Gdp.IServer.Ui.Web.Hubs
{
    using Microsoft.AspNet.SignalR.Hubs;
    [HubName("iServerHub")]
    public class IServerHub