c# – AutoMapper.dll中出现’AutoMapper.AutoMapperMappingExce

public class ClientViewModel
    {
        [Required(ErrorMessage = "The Client Code field is required.")]  
        public string ClientCode { get; set; }
        [Required(ErrorMessage = "The Company Legal Name field is required.")]  
        public string CompanyLegalName { get; set; }
        public string Notes { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string Zip { get; set; }
        public Nullable<DateTime> ScheduledDate { get; set; }
        public Nullable<decimal> AmountDiscount { get; set; }
    }

    public class Client
    {
        public string ClientCode { get; set; }   
        public string CompanyLegalName { get; set; }
        public string Notes { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string Zip { get; set; }
        public Nullable<DateTime> ScheduledDate { get; set; }
        public Nullable<decimal> AmountDiscount { get; set; }
    }

编辑：

Exception Details: AutoMapper.AutoMapperMappingException: Missing type
map configuration or unsupported mapping.

Mapping types: Client -> ClientViewModel myapp.Models.Client ->
myapp.Models.ClientViewModel

Destination path: ClientViewModel

Source value: myapp.Models.Client

我的客户& ClientViewModel具有完全相同数量的道具,下面是我正在使用的代码及其抛出错误而没有获得太多信息,我在这里缺少什么？

Client client = context.Clients.Where(x => x.CustomerID == id).FirstOrDefault();
ClientViewModel clientViewModel = Mapper.Map<Client,ClientViewModel>(client);

An exception of type ‘AutoMapper.AutoMapperMappingException’ occurred
in AutoMapper.dll but was not handled in user code