Why I am getting error on fetching data with autorefresh using Signal R Technology?

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Why I am getting the error on fetching data with autorefresh using Signal R Technology?


I am getting the error on fetching data with autorefresh using Signal R Technology
I am using VS 2010(Framework 4.0) with asp.net. I did so refering the link
http://techbrij.com/database-change-notifications-asp-net-signalr-sqldependency

<script src="http://code.jquery.com/jquery-1.8.2.min.js" type="text/javascript"></script>

    <script src="Scripts/jquery.signalR-1.1.4.js" type="text/javascript"></script>

    <script src="/signalr/hubs" type="text/javascript"></script>


      <script type="text/javascript">


          $(function () {

              // Proxy created on the fly
              var job = $.connection.scoresHub;

              // Declare a function on the score hub so the server can invoke it
              job.client.displayStatus = function () {
                  getData();
              };

              // Start the connection
              $.connection.hub.start();
              getData();
          });


          function getData() {
              alert("a");
              var $tbl = $('#tblJobInfo');
              $.ajax({
                  url: 'GridScore.aspx/GetScoresTable',
                  type: 'GET',
                  datatype: 'json',

                  success: function (data) {
                      if (data.length > 0) {
                          $tbl.empty();
                          $tbl.append(' <tr><th>Job Title</th><th>Published Date</th><th>Expiry Date</th><th>Job Status</th></tr>');
                          var rows = [];
                          for (var i = 0; i < data.length; i++) {
                              rows.push(' <tr><td>' + data[i].JobTitle + '</td><td>' + data[i].PublishedDate + '</td><td>' + data[i].ExpiryDate + '</td><td>' + data[i].JobStatus + '</td></tr>');
                          }
                          $tbl.append(rows.join(''));
                      }
                  }
              });
          }
</script>

<div>
 <table id="tblJobInfo" style="text-align:center;margin-left:10px">
        </table>

</div>
 <form id="form1" runat="server">

        <asp:GridView ID="GridViewScores" runat="server">
        </asp:GridView>
        <p>



        </p>
        <h3>View this page with multiple browsers to see how SignalR works!</h3>
    </form>

.

Error is as below:
Failed to load resource: the server responded with a status of 404 (Not Found) http://localhost:1861/signalr/hubs
Uncaught TypeError: Cannot read property 'client' of undefined