Automapper Missing Map Configuration

I have an Attendee Class and An AttendeeViewModel

The datetime field on the Attendee Model gets set to the default .NET Datetime when i map it from AttendeeViewModel instead of the value that is already existing in the Attendee Model

Here's my AttendeeViewModel

public class AttendeeViewModel
{

    public int Id { get; set; }
    [Required]
    [EmailAddress]
    public string Email { get; set; }
    [Required]
    [Display(Name = "First Name")]
    public string FirstName { get; set; }
    [Required]
    [Display(Name = "Last Name")]
    public string LastName { get; set; }
    public int FEventId { get; set; }

    public string DisplayName
    {
        get { return string.Format("{0}, {1}", FirstName, LastName); }
    }
}

Here's my Base AttendeeModel

public class Attendee
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public  int Id { get; set; }
    [Required]
    public  string Email { get; set; }
    [Required]
    public  string FirstName { get; set; }
    [Required]
    public  string LastName { get; set; }
    public DateTime CreatedAt { get; set; }

    public bool IsActive { get; set; }


    public int FEventId { get; set; }

    public virtual ApplicationUser CreatedBy { get; set; }

    public virtual FEvent FEvent { get; set; }

    public ICollection<ProjectPledge> ProjectPledges { get; set; } 

}

Here's My mapping configuration

public static void Configure()
    {

       Mapper.CreateMap<AttendeeViewModel, Attendee>().ForMember(dest=>dest.CreatedAt , opt=>opt.Ignore());

    } 

And heres's the Controller Action

[HttpPost]
    [ValidateAntiForgeryToken]
    public virtual ActionResult Edit(AttendeeViewModel attendee)
    {
        if (!_attendeeService.CanAddAttendee(attendee.Email, attendee.FilanthropyEventId))
        {
            AddEmailModelError();
        }

        if (ModelState.IsValid)
        {
            var mappedAttendee = _attendeeService.GetById(attendee.Id);

            mappedAttendee = Mapper.Map<AttendeeViewModel, Attendee>(attendee);
            _attendeeService.AddOrUpdate(mappedAttendee);
            return RedirectToAction(MVC.Attendee.Index(mappedAttendee.FilanthropyEventId));
        }
        return View(attendee);
    }

if I set the configuration to be this insetad of opt.Ignore()

Mapper.CreateMap<AttendeeViewModel, Attendee>().ForMember(dest=>dest.CreatedAt , opt=>opt.UseDestinationValue());

The Mapping fails giving this exception

Missing type map configuration or unsupported mapping.

Mapping types:
AttendeeViewModel -> DateTime
MyProject.Web.ViewModels.AttendeeViewModel -> System.DateTime

Destination path:
Attendee.CreatedAt.CreatedAt

Source value:
MyProject.Web.ViewModels.AttendeeViewModel

Any ideas on how i can resolve this?