>So, I am still getting the error :(
>

>AutoMapper.AutoMapperMappingException was unhandled by user code
>  HResult=-2146233088
>  Message=Missing type map configuration or unsupported mapping.
>
>Mapping types:
>GstPass - EditPassViewModel
>Siriusware.Models.GstPass -> SysManager.Web.Areas.Guests.Models.EditPassViewModel
>
>Destination path:
>EditPassViewModel
>
>Source value:
>Siriusware.Models.GstPass
>  Source=AutoMapper
>  StackTrace:
>       at SysManager.Web.Areas.Guests.Controllers.GstPassApiController.GetGuestPass(Int64 id) in D:\_Siriusware\Main\SysManager\SysManager.Web\Areas\Guests\Controllers\PassesApiController.cs:line 36
>       at lambda_method(Closure , Object , Object[] )
>       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)
>       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)
>       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
>  InnerException: 
>

>
>My mapping is defined this way:
>
>

> //Post
>            CreateMap<EditPassViewModel, GstPass>().IgnoreAllNonExisting();
>
>            //GET
>            CreateMap<GstPass, EditPassViewModel>().IgnoreAllNonExisting()
>            //.ForMember(dest => dest.LastUse,
>            //    opt => opt.ResolveUsing<TrimStringResolver>().FromMember(source => source.LastUse.Value.ToString()))
>
>            .ForMember(dest => dest.Operator, opt => opt.MapFrom(source => source.Operator ))
>            .ForMember(dest => dest.BlReason,
>                   opt => opt.ResolveUsing<TrimStringResolver>().FromMember(source => source.BlReason.ToString()));
>

>
>I've searched the project and I found many models with the @Operator string property. They all work, so something else may be at play.
>
>I really don't know what else may I try to fix it :(

Not the problem but what is this line for ? :

.ForMember(dest => dest.Operator, opt => opt.MapFrom(source => source.Operator ))