C# – The ObjectContext instance has been disposed and can no longer be used for operations that require a connection

I'm sorry for the repetition. I'm heading with a same problem but still could not handle it. I'm using Angularjs framework and Asp.net mvc.

My person class:

public partial class Person
{
    public int PersonID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Telephone { get; set; }
    public string Adress { get; set; }
    public int UserID { get; set; }

    public virtual User User { get; set; }
}

My User class:

public partial class User
{
    public User()
    {
        this.People = new HashSet<Person>();
    }

    public int UserID { get; set; }
    public string Username { get; set; }
    public string Password { get; set; }
    public string FullName { get; set; }
    public string Email { get; set; }
    public string Gender { get; set; }

    public virtual ICollection<Person> People { get; set; }
}

My js code:

 $http.get('/Data/GetPeople', { params: { UserID: "1" } }).success(function (data) {
        $scope.model = data;
    });

I'm trying to get records from my database:

 public ActionResult GetPeople(int UserID)
    {

        using (PersonEntities dc = new PersonEntities())
        {
            var model = new PersonIndexVM();
            model.People = dc.People.Where(b => b.UserID == UserID).ToList();
            //model.People = dc.People.Include("User").ToList();
            return Json(model, JsonRequestBehavior.AllowGet);
        }

    }

As I see with debugging, I'm getting the right objects from database in GetPeople method. But after that I'm getting this error:

'The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.'

I tried to Eagerly load: model.People = dc.People.Include("User").Where(b => b.UserID == UserID).ToList(); Still getting the same error.

It would be a pleasure if you help me.