Automapper nested object null after mapping

I have two entities :

public class TableA
  {

    public int id { get; set; }   
    public virtual TableB TableB { get; set; }
}



public class TableB
 {
   public TableB()
   {
     TableAList = new List<TableA>();
   }
   public int id { get; set; }
   public virtual List<TableA> TableAList { get; set; }
 }

And two classes

public class ClasseMetierA
  {
    private int id;
    public ClasseMetierB TableB;
}


public class ClasseMetierB
  {
                 public ClassMetierB()
        {
            TableAList = new List<ClasseMetierAList>();
        }
    private int id;   
    public List<ClasseMetierA> TableAList { get; set; }
}

I would like to convert TableB object into ClasseMetierB object. I'm using automapper with this configuration :

mapperConfig = new MapperConfiguration(cfg =>
        {

                    cfg.CreateMap<TableA, ClasseMetierA>().MaxDepth(3);
                    cfg.CreateMap<TableB, ClasseMetierB>().MaxDepth(3);

        });
        mapperConfig.AssertConfigurationIsValid();

I'm calling this function to convert my object :

public B ConvertDTB(D obj)
    {
      var mapper = mapperConfig.CreateMapper();
      return mapper.Map<B>(obj);
    }

The problem is the following : When I convert an TableB object into a ClasseMetierB object, the properties of all the elements in TableAList are all null, even if the sources properties (TableB.TableAList) were not.

I found this post (Nested object members null after mapping with Automapper) with a similar problem but the solution given just raise a null exception error.

Thanks in advance