ApplicationSignInManager could not be found?

Question

Hi Team

 

I am having Startup class and create below properties, some strange reason it does not want to load dll file to these libraries 'ApplicationSignInManager could be found, missing some assembly?' 

using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.Owin;
using Microsoft.Owin.Security.Cookies;
using Owin;
using eNtsaTrainingRegistration.Models;

namespace eNtsaTrainingRegistration
{
    public partial class Startup
    {
        public void ConfigureAuth(IAppBuilder app)
        {
            app.CreatePerOwinContext(ApplicationDbContext.Create);
            app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create); // Error message.
        }
    }
}