autofac的错误，是在找不出来哪里的问题，请教大神。。。

builder.RegisterType < MainBcUnitOfWork>()
.As<Booking.Beta.Implement.Interface.IUnitOfWork>()
.InstancePerLifetimeScope();

builder.RegisterType<Booking.Beta.Implement.DoctorAttachRepository>()
.As<Booking.Beta.Implement.Interface.IDoctorAttach>();

------------------------------------

public class DoctorAttachRepository:Repository<DoctorAttach>,IDoctorAttach
{
public DoctorAttachRepository(MainBcUnitOfWork context)
: base(context)
{
}
}

--------------------------

public class Repository<TEntity> : IRepository<TEntity> where TEntity : class
{
#region Members

public IUnitOfWork UnitOfWork { get; set; }

#endregion

#region Constructor

/// <summary>
/// Create a new instance of repository
/// </summary>
public Repository(IUnitOfWork unitOfWork)
{
if (unitOfWork == null) throw new ArgumentNullException("unitOfWork");

UnitOfWork = unitOfWork;

}

---------------------------

/// <summary>
///
/// </summary>
public class MainBcUnitOfWork:DBClinicBook,IUnitOfWork
{
public MainBcUnitOfWork()
{

}