asp.net-mvc – MVC包含路径无效错误

public ActionResult Index(int? id)
{
    var userEmail = User.Identity.Name;
    var model = db.Staffs.Where(i => i.Email == userEmail).Include("Histories").Include("CurrentApplications").FirstOrDefault();


    return View(model);
}

行var var model = db.Staffs.Where(i => i.Email == userEmail).Include(“Histories”).包含(“CurrentApplications”).FirstOrDefault();但我不知道为什么我得到它.

错误

A specified Include path is not valid. The EntityType
‘StaffPortalDBModel.Staff’ does not declare a navigation property with
the name ‘Histories’.

员工班

public partial class Staff
{
    public int StaffID { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public Nullable<decimal> AllocatedLeave { get; set; }
    public Nullable<int> BalanceLeave { get; set; }

    public virtual IEnumerable<History> Histories { get; set; }
    public virtual IEnumerable<CurrentApplication> CurrentApplications { get; set; }
}