Cookie Authentication with ASP.NET 5 MVC 6 Web API

I totally understand if someone finds that my question is very basic or might not make a lot of sense all the way. I am new to this and I am trying to use the latest .NET Framework 5 with MVC 6 in order to build a Web Api that could be used from an Angular JS client-side. This will allow me to create a website for it, as well as a mobile application by wrapping it with Phonegap. So please bear with me a bit.

What I am trying to achieve for the moment is to have a Web API controller that receives a login request and returns a result to the client based on Cookie Authentication (later the client should store this cookie and use it for communications with the server)

• I added the following in the project.json

• In the Startup.cs, I added under ConfigureServices:

  // Add entity framework support
  services.AddEntityFramework()
      .AddSqlServer()
      .AddDbContext<ApplicationDbContext>(options =>
      {
          options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]);
      });
  
      // add ASP.NET Identity
      services.AddIdentity<ApplicationUser, IdentityRole>(options => {
          options.Password.RequireDigit = false;
          options.Password.RequireLowercase = false;
          options.Password.RequireUppercase = false;
          options.Password.RequireNonLetterOrDigit = false;
          options.Password.RequiredLength = 6;
      })
         .AddEntityFrameworkStores<ApplicationDbContext>()
         .AddDefaultTokenProviders();
  

• In the Startup.cs, under Configure:

      // Using the identity that technically should be calling the UseCookieAuthentication
      app.UseIdentity();
  

Now, in the Controller method to login, I am able to find the user using its email address and the UserManager:

            // Verify that the model is valid according to the validation rules in the model itself. 
            // If it isn't valid, return a 400 Bad Request with some JSON reviewing the errors
            if (!ModelState.IsValid)
            {
                return HttpBadRequest(ModelState);
            }

            // Find the user in our database.  If the user does not exist, then return a 400 Bad Request with a general error.
            var user = await userManager.FindByEmailAsync(model.Email);
            if (user == null)
            {
                ModelState.AddModelError("", INVALID_LOGIN_MESSAGE);
                return HttpBadRequest(ModelState);
            }

            // If the user has not confirmed his/her email address, then return a 400 Bad Request with a request to activate the account.
            if (!user.EmailConfirmed)
            {
                ModelState.AddModelError("Email", "Account not activated");
                return HttpBadRequest(ModelState);
            }

            // Authenticate the user with the Sign-In Manager
            var result = await signInManager.PasswordSignInAsync(user.UserName, model.Password, model.RememberMe, lockoutOnFailure: false);
            // If the authentication failed, add the same error that we add when we can't find the user
            // (so you can't tell the difference between a bad username and a bad password) and return a 400 Bad Request
            if (!result.Succeeded)
            {
                ModelState.AddModelError("", INVALID_LOGIN_MESSAGE);
                return new BadRequestObjectResult(ModelState);
            }

            return Ok();

The problem is happening at the line:

            // Authenticate the user with the Sign-In Manager
            var result = await signInManager.PasswordSignInAsync(user.UserName, model.Password, model.RememberMe, lockoutOnFailure: false);

it is throwing the following error:

Error: No authentication handler is configured to handle the scheme: Microsoft.AspNet.Identity.Application

I am currently blocked and I searched googled for almost every possible token I could think of and tried multiple solution still in no vain. Any help is highly appreciated.

Regards,