I need SignalR concept for Visual Studio 2010

Hi  i am new for SignalR concept some concept is not understand and geting errors

i am using Visual Studio 2010 service pack1
using Microsof.aspnet.signalR version 1.1.3 used as Nuget package Manager console for installing Package
i use SignalR for chat Application getting Error as 

"JavaScript runtime error: Unable to get property 'client' of undefined or null reference" after ignore button click
JavaScript runtime error: SignalR: Error loading hubs. Ensure your hubs reference is correct, e.g. <script src='/signalr/js'></script>.

this shows in html page as error warning
"throw new Error("SignalR: Error loading hubs. Ensure your hubs reference is correct, e.g. <script src='/signalr/js'><\/script>.")"


how to add reference and get connection to SignalR process for develop chat Appliction give me some example for demo how to add signalR references.
thanks