Using Automapper for Many-To-Many Relationships - asp.net-mvc

Question

I'm trying to use Automapper for a many-to-many relationship and entity framework.
This is my entity:
public class ZChangeUnits
{
[Key]
public string CCode1 { get; set; }
[ForeignKey("CCode1")]
public virtual ZUnits ZUnits1 { get; set; }
[Key]
public string CCode2 { get; set; }
[ForeignKey("CCode2")]
public virtual ZUnits ZUnits2 { get; set; }
public decimal NZarib { get; set; }
}
And this is ZUnit entity:
[Key]
public string CCode { get; set; }
public string CTitle { get; set; }
public string CMGCode { get; set; }
public virtual ZCodes ZCodes { get; set; }
I want to map them to this ViewModel, probably I should remove Titles:
public class ChangeUnitsViewModel
{
public string CCode1 { get; set; }
public string ZUnitsCTitle1 { get; set; }
public string CCode2 { get; set; }
public string ZUnitsCTitle2 { get; set; }
public decimal NZarib { get; set; }
}
And this is the mapping I'm currently using:
Mapper.CreateMap<ZChangeUnits, ChangeUnitsViewModel>()
.ForMember(d => d.ZUnitsCTitle1,
o => o.MapFrom(s => s.ZUnits1.CTitle))
.ForMember(d => d.ZUnitsCTitle2,
o => o.MapFrom(s => s.ZUnits2.CTitle));
But it doesn't seem valid and gives the Missing type map configuration or unsupported mapping. exception.
Can you please guide me about how I can use Automapper to perform a basic CRUD operation on this class? Any useful link, I have no idea how to use it.
To make this really complete, this is my controller!
var data = exchangeRepo.GetAll().ToList();
var d = AutoMapper.Mapper.Map<ChangeUnitsViewModel>(data);