Signalr/Hub not found Error

using Microsoft.AspNet.SignalR;
using Microsoft.Owin;
using Owin;
[assembly: OwinStartup(typeof(SignalR_SQLServer_Notification_Hubs.Startup))]
namespace SignalR_SQLServer_Notification_Hubs
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
// Any connection or hub wire up and configuration should go here
app.MapSignalR();
//GlobalHost.HubPipeline.AddModule(new RejoingGroupPipelineModule());
}
}
}