سلام یک سرویس نوشتم و در startup صدا زدم داخل سرویس از Repository استفاده کردم اما هنگام اجرای پروژه به application dbcontext داخل repository ها خطا میده ؟ علتش چیه ؟
service

public class TimedHostedService : IHostedService, IDisposable
    {
        private readonly ILogger _logger;
        private Timer _timer;
        private readonly IEmailSender _emailSender;
        private readonly ITicketMasterRepository _ticketMaster_Repository;

        public TimedHostedService(ILogger<TimedHostedService> logger, IEmailSender emailSender, ITicketMasterRepository ticketMaster_Repository
           )
        {
            _logger = logger;
            _emailSender = emailSender;
            _ticketMaster_Repository = ticketMaster_Repository;
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation("Timed Background Service is starting.");

            _timer = new Timer(DoWork, null, TimeSpan.Zero,TimeSpan.FromDays(1));

            return Task.CompletedTask;
        }

        private void DoWork(object state)
        {
           
            _emailSender.SendEmailAsync("elahi1mahdi@yahoo.com","5 Second","5 ثانیه ");
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation("Timed Background Service is stopping.");

            _timer?.Change(Timeout.Infinite, 0);

            return Task.CompletedTask;
        }

        public void Dispose()
        {
            _timer?.Dispose();
        }
    }

 services.AddSingleton<IHostedService, TimedHostedService>();
             services.AddSingleton<ITicketMasterRepository, TicketMasterRepository > (); 

Error

Cannot consume scoped service 'DataLayer.ApplicationDbContext' from singleton 'Services.Repositories.ITicketMasterRepository