app.MapSignalR(); are error (assembly referece are missing)

using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(MyPushNotificationMNMN.Startup1))]

namespace MyPushNotificationMNMN
{
public class Startup1
{
public void Configuration(IAppBuilder app)
{
// For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=316888
app.MapSignalR(); //error owin.iappbuilder does not contain a definition for mapsignalr
}
}
}
using libraray jquery.signalR-2.2.0.js and jquery.signalR-2.2.0.min.js