Bei der Verarbeitung des Anforderungs-ASP .NET Core ist eine nicht behandelte Ausnahme aufgetreten

Ich bin neu im ASP .net Core. Es gibt mir einen Abhängigkeitsinjektionsfehler als:

InvalidOperationException: Dienst für Typ 'Spinit.Data.Services.Repository.GameRepository' kann nicht aufgelöst werden, während versucht wird, 'SpinIt.Web.Controllers.CartController' zu aktivieren. Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService (IServiceProvider sp, Typ type, Type requiredBy, bool isDefaultParameterRequired)

StackTrace ist unten:

Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, bool isDefaultParameterRequired)
lambda_method(Closure , IServiceProvider , object[] )
Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider+<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext)
Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider+<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.MigrationsEndPointMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

CartController- Code

public class CartController:Controller
{
    private readonly GameRepository _gameRepository;
    private readonly Cart _cartRepository;

    public CartController(GameRepository gameRepository, Cart cartRepository)
    {
        _gameRepository = gameRepository;
        _cartRepository = cartRepository;
    }

    public ViewResult Index()
    {
        var items = _cartRepository.GetCartItems();
        _cartRepository.CartItems = items;

        var sCVM = new CartViewModel
        {
            Cart = _cartRepository,
            CartTotal = _cartRepository.GetCartTotal()
        };
        return View(sCVM);
    }
}

Ich habe auch Service zu Startup.cs hinzugefügt

services.AddScoped<IGame, GameRepository>();
services.AddScoped<ICartItem, CartItemRepository>();