Entity Framework 6 - Knowledge Base (KB)

The type or namespace name 'SignInManager' could not be found (are you missing a using directive or an assembly reference?)

I've been following the steps given in this website: ...http://www.asp.net/web-forms/overview/getting-started/getting-started-with-aspnet-45-web-forms/checkout-and-payment-with-paypal.... I am already on the "Modifying Login Functionality". There seems to...