System.ArgumentNullException:Value cannot be null

Question

Hi Team

 

I am facing this issue on my IdentityConfig.cs using asp.net mvc to build user login registration. How do i fix this issue? Please assist me, thanks.

public class ApplicationSignInManager : SignInManagerstring>
   {
       public ApplicationSignInManager(ApplicationUserManager userManager, IAuthenticationManager authenticationManager)
           : base(userManager, authenticationManager) // System exception here.
       {
       }

       public override Task CreateUserIdentityAsync(ApplicationUser user)
       {
           return user.GenerateUserIdentityAsync((ApplicationUserManager)UserManager);
       }

       public static ApplicationSignInManager Create(IdentityFactoryOptions options, IOwinContext context)
       {
           return new ApplicationSignInManager(context.GetUserManager(), context.Authentication);
       }
   }