AutoMapperMappingException: Missing type map configuration or unsupported mapping IN .NET 6 - asp.net-core

Question

I have this entity:
public class Genres
{
public int Id { get; set; }
[Required(ErrorMessage ="the field {0} is required")]
[StringLength(50)]
[FirstLetterUpperCase]
public string Name { get; set; }
}
And this DTO or model:
public class GenresDTO
{
public int Id { get; set; }
public string Name { get; set; }
}
I have initiated my mapper like this:
public class AutoMapperClass : Profile
{
public AutoMapperClass()
{
generateMapper();
}
private void generateMapper()
{
CreateMap<GenresDTO, Genres>().ReverseMap();
CreateMap<GenresCreationDTO, Genres>();
}
}
I have also written this part of code in my program.cs :
builder.Services.AddAutoMapper(typeof(IStartup));
I am using .NET 6 and Visual Studio, and when I run my project, I get an error that is mentioned in the title and its related to this section :
public async Task<ActionResult<List<GenresDTO>>> Get()
{
var genres = await dbContext.Genres.ToListAsync();
return mapper.Map<List<GenresDTO>>(genres);
}
which is in my Controller file, and I initiated the mapper like this :
private readonly ILogger<GenresController> ilogger;
private readonly ApplicationDBContext dbContext;
private readonly IMapper mapper;
public GenresController(ILogger<GenresController> ilogger,
ApplicationDBContext dbContext , IMapper mapper)
{
this.ilogger = ilogger;
this.dbContext = dbContext;
this.mapper = mapper;
}

Answer 1

Should be probably typeof(Program) in registration (assuming that you are using .Net6 where we have only Program.cs)
builder.Services.AddAutoMapper(typeof(Program))
If you have multiple projects in solution,then value used there should be a file in the assembly in which the mapping configuration resides.