Error on flatting

gistfile1.txt

public class Nested
{
    public int Property1 {get;set;}
    public string Property2 {get;set;}
}

public  class Model
{
    public int Id { get; set; }
    public int ParentId { get; set; }
    public int NestedId { get; set; }
    public int Position { get; set; }
    public bool? IsOk { get; set; }
    public virtual Nested Nested { get; set; }
}

public class Dto
{
    public Guid Guid { get; set; }
    public Guid ParentGuid { get; set; }
    public int Id { get; set; }
    public int ParentId { get; set; }
    public int NestedId { get; set; }
    public int Position { get; set; }
    public bool? IsOk { get; set; }

    [XmlIgnore]
    public int Property1 { get; set; }

    [XmlIgnore]
    public string Property2 { get; set; }
}

Mapper.Initialize(cfg =>
{
  cfg.CreateMap<model, dto>()
     .ForMember(dest => dest.Guid, option => option.Ignore())
     .ForMember(dest => dest.ParentGuid, option => option.Ignore())
     .ForMember(dest => dest.Property1, option => option.MapFrom(src => src.Nested.Property1))
     .ForMember(dest => dest.Property2, option => option.MapFrom(src => src.Nested.Property2))
     .ReverseMap();
});