Controller Scaffolding in MVC 5

Hi,

I am developing an application using mvc 5 in Visual Studio 2012. I have successfully build my model class.

My Model class:

using System;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;

namespace NewMvcDemo.Models
{
    public class User
    {
        [Key]
        public int ID { get; set; }
        public string  Name { get; set; }
        public string City { get; set; }
        public string Company { get; set; }
    }

    public class UserDbContext : DbContext
    {
        public DbSet<User> NewUser { get; set; }
    }
}

When i want to add a New Scaffolded item in controller , the following error occur: