title: how to map nested List to another List with AutoMapper
body: <p>I am using Latest version of Auto Mapper <code>6.1.0'</code>.
  I have  <code>Poll</code> and <code>PolOption</code> Tables like below:</p>
  <pre><code>public class Poll
  {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Body { get; set; }
        public virtual ICollection&lt;PollOption&gt; Options { get; set; }
  }
  
  public class PollOption 
  {
     public virtual string Title { get; set; }
     public int Id { get; set; }
     public int PollId { get; set; }
     public virtual Poll Poll { get; set; }
  }
  </code></pre>
  <p>and I have two <code>viewModels</code> for these Models  Like :</p>
  <pre><code>public class EditPollViewModel
  {
      public int Id { get; set; }
      public virtual string Title { get; set; }
      public List&lt;PollOptionViewModel&gt; Options { get; set; }
  }
  public  class PollOptionViewModel
  {
      public int Id { get; set; }
      public string Title { get; set; }
  
  }
  </code></pre>
  <p>I am using this for Auto Mapper config :</p>
  <pre><code>config.CreateMap&lt;Poll, EditPollViewModel&gt;().ForMember(dest =&gt; dest.Options, src =&gt; src.MapFrom(t =&gt; t.Options));
  </code></pre>
  <p>but when I am runing project With below code I have gotten Error .</p>
  <pre><code> return Mapper.Map&lt;EditPollViewModel&gt;(model);
  </code></pre>
  <p>I have gotten this error :</p>
  <blockquote>
  <p>Missing type map configuration or unsupported mapping.</p>
  <p>Mapping types: PollOption -&gt; PollOptionViewModel</p>
  <p>PollOption -&gt;</p>
  <p>PollOptionViewModel</p>
  </blockquote>