title: AutoMapper exception
body: <p>When I run the line of code Mapper.Map(Account, User); I get a "Missing type map configuration or unsupported mapping" exception.  I'd also like to note that the line Mapper.Map(Account); does not throw an exception and returns the expected results. What I'm trying to do is move the values from Account to User without creating a new instance of User. Any help would be great. Thanks!</p>
  
  <pre><code>public class AccountUpdate
  {
      [Email]
      [Required]
      public string Email { get; set; }
  
      [Required]
      [StringLength(25, MinimumLength = 3, ErrorMessage = "Your name must be between 3 and 25 characters")]
      public string Name { get; set; }
  
      public string Roles { get; set; }
  }
  
  public class User
  {
      public User()
      {
          Roles = new List&lt;Role&gt;();
      }
      public int UserId { get; set; }
      public string Email { get; set; }
      public string Name { get; set; }
      public byte[] Password { get; set; }
      public byte[] Salt { get; set; }
      public DateTime CreatedOn { get; set; }
      public DateTime LastLogin { get; set; }
      public virtual ICollection&lt;Role&gt; Roles { get; set; }
  }
  
  
  Mapper.CreateMap&lt;AccountUpdate, User&gt;().ForMember(d =&gt; d.Roles, s =&gt; s.Ignore());
  </code></pre>