"We're sorry, an internal error occurred."

In trying to complete an import, I got the following error :
We're sorry, an internal error occurred.

Our supporting staff has been notified of this error and will address the issue shortly.

We apologize for the inconvenience.

Please try clicking your browsers 'back' button or try reloading the home page.

If you continue to receive this message, please try again in a little while.

Thank you for your patience.




Any ideas on what might be causing this?

This is a standard notification. Login to your admin panel, go to System -> Log, there you will see list of errors. Look there for a reason.

Best,
Patryk

To find out what went wrong you need to turn off the custom errors mode.

1. Open appsettings.json file
2. Find out the following line "DisplayFullErrorStack": false,
3. Replace it with "DisplayFullErrorStack": true
4. Restart the site

Also, check Admin > System > Log for any errors.

I am getting the same error. I have downloaded nopCommerce 4.1 no source files and I'm trying to do the install with the creation of the database but no test data. I have Microsoft .Net Core 2.2 installed and .Net Core SDK 2.1.5 installed. nopCommerce does not start.

Please check permission for IISUSER for Plugins folder, AppData folder and web.config file.

ShortMessage: An error occurred when trying to create a controller of type 'SevenSpikes.Nop.Plugins.QuickView.Controllers.QuickViewCatalogController'. Make sure that the controller has a parameterless public constructor.



full Message:System.InvalidOperationException: An error occurred when trying to create a controller of type 'SevenSpikes.Nop.Plugins.QuickView.Controllers.QuickViewCatalogController'. Make sure that the controller has a parameterless public constructor. ---> Autofac.Core.DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = QuickViewCatalogController (ReflectionActivator), Services = [SevenSpikes.Nop.Plugins.QuickView.Controllers.QuickViewCatalogController], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> An exception was thrown while invoking the constructor 'Void .ctor(Nop.Web.Factories.IProductModelFactory, Nop.Services.Catalog.ICategoryService, Nop.Services.Catalog.IManufacturerService, Nop.Services.Catalog.IProductService, Nop.Services.Vendors.IVendorService, Nop.Services.Catalog.IProductTemplateService, Nop.Services.Catalog.IProductAttributeService, Nop.Core.IWorkContext, Nop.Core.IStoreContext, Nop.Services.Tax.ITaxService, Nop.Services.Directory.ICurrencyService, Nop.Services.Media.IPictureService, Nop.Services.Localization.ILocalizationService, Nop.Services.Directory.IMeasureService, Nop.Services.Catalog.IPriceCalculationService, Nop.Services.Catalog.IPriceFormatter, Nop.Core.IWebHelper, Nop.Services.Catalog.ISpecificationAttributeService, Nop.Services.Helpers.IDateTimeHelper, Nop.Services.Catalog.IRecentlyViewedProductsService, Nop.Services.Catalog.ICompareProductsService, Nop.Services.Messages.IWorkflowMessageService, Nop.Services.Catalog.IProductTagService, Nop.Services.Orders.IOrderReportService, Nop.Services.Orders.IOrderService, Nop.Services.Security.IAclService, Nop.Services.Stores.IStoreMappingService, Nop.Services.Security.IPermissionService, Nop.Services.Media.IDownloadService, Nop.Services.Logging.ICustomerActivityService, Nop.Services.Catalog.IProductAttributeParser, Nop.Services.Shipping.IShippingService, Nop.Services.Events.IEventPublisher, Nop.Core.Domain.Media.MediaSettings, Nop.Core.Domain.Catalog.CatalogSettings, Nop.Core.Domain.Vendors.VendorSettings, Nop.Core.Domain.Orders.ShoppingCartSettings, Nop.Core.Domain.Localization.LocalizationSettings, Nop.Core.Domain.Customers.CustomerSettings, Nop.Web.Framework.Security.Captcha.CaptchaSettings, Nop.Core.Domain.Seo.SeoSettings, Nop.Core.Caching.ICacheManager, SevenSpikes.Nop.Plugins.QuickView.Domain.QuickViewSettings)' on type 'QuickViewCatalogController'. ---> Method not found: 'Void Nop.Web.Controllers.ProductController..ctor(Nop.Web.Factories.IProductModelFactory, Nop.Services.Catalog.IProductService, Nop.Core.IWorkContext, Nop.Core.IStoreContext, Nop.Services.Localization.ILocalizationService, Nop.Core.IWebHelper, Nop.Services.Catalog.IRecentlyViewedProductsService, Nop.Services.Catalog.ICompareProductsService, Nop.Services.Messages.IWorkflowMessageService, Nop.Services.Orders.IOrderReportService, Nop.Services.Orders.IOrderService, Nop.Services.Security.IAclService, Nop.Services.Stores.IStoreMappingService, Nop.Services.Security.IPermissionService, Nop.Services.Logging.ICustomerActivityService, Nop.Services.Events.IEventPublisher, Nop.Core.Domain.Catalog.CatalogSettings, Nop.Core.Domain.Orders.ShoppingCartSettings, Nop.Core.Domain.Localization.LocalizationSettings, Nop.Web.Framework.Security.Captcha.CaptchaSettings, Nop.Core.Caching.ICacheManager)'. (See inner exception for details.) (See inner exception for details.) ---> Autofac.Core.DependencyResolutionException: An exception was thrown while invoking the constructor 'Void .ctor(Nop.Web.Factories.IProductModelFactory, Nop.Services.Catalog.ICategoryService, Nop.Services.Catalog.IManufacturerService, Nop.Services.Catalog.IProductService, Nop.Services.Vendors.IVendorService, Nop.Services.Catalog.IProductTemplateService, Nop.Services.Catalog.IProductAttributeService, Nop.Core.IWorkContext, Nop.Core.IStoreContext, Nop.Services.Tax.ITaxService, Nop.Services.Directory.ICurrencyService, Nop.Services.Media.IPictureService, Nop.Services.Localization.ILocalizationService, Nop.Services.Directory.IMeasureService, Nop.Services.Catalog.IPriceCalculationService, Nop.Services.Catalog.IPriceFormatter, Nop.Core.IWebHelper, Nop.Services.Catalog.ISpecificationAttributeService, Nop.Services.Helpers.IDateTimeHelper, Nop.Services.Catalog.IRecentlyViewedProductsService, Nop.Services.Catalog.ICompareProductsService, Nop.Services.Messages.IWorkflowMessageService, Nop.Services.Catalog.IProductTagService, Nop.Services.Orders.IOrderReportService, Nop.Services.Orders.IOrderService, Nop.Services.Security.IAclService, Nop.Services.Stores.IStoreMappingService, Nop.Services.Security.IPermissionService, Nop.Services.Media.IDownloadService, Nop.Services.Logging.ICustomerActivityService, Nop.Services.Catalog.IProductAttributeParser, Nop.Services.Shipping.IShippingService, Nop.Services.Events.IEventPublisher, Nop.Core.Domain.Media.MediaSettings, Nop.Core.Domain.Catalog.CatalogSettings, Nop.Core.Domain.Vendors.VendorSettings, Nop.Core.Domain.Orders.ShoppingCartSettings, Nop.Core.Domain.Localization.LocalizationSettings, Nop.Core.Domain.Customers.CustomerSettings, Nop.Web.Framework.Security.Captcha.CaptchaSettings, Nop.Core.Domain.Seo.SeoSettings, Nop.Core.Caching.ICacheManager, SevenSpikes.Nop.Plugins.QuickView.Domain.QuickViewSettings)' on type 'QuickViewCatalogController'. ---> Method not found: 'Void Nop.Web.Controllers.ProductController..ctor(Nop.Web.Factories.IProductModelFactory, Nop.Services.Catalog.IProductService, Nop.Core.IWorkContext, Nop.Core.IStoreContext, Nop.Services.Localization.ILocalizationService, Nop.Core.IWebHelper, Nop.Services.Catalog.IRecentlyViewedProductsService, Nop.Services.Catalog.ICompareProductsService, Nop.Services.Messages.IWorkflowMessageService, Nop.Services.Orders.IOrderReportService, Nop.Services.Orders.IOrderService, Nop.Services.Security.IAclService, Nop.Services.Stores.IStoreMappingService, Nop.Services.Security.IPermissionService, Nop.Services.Logging.ICustomerActivityService, Nop.Services.Events.IEventPublisher, Nop.Core.Domain.Catalog.CatalogSettings, Nop.Core.Domain.Orders.ShoppingCartSettings, Nop.Core.Domain.Localization.LocalizationSettings, Nop.Web.Framework.Security.Captcha.CaptchaSettings, Nop.Core.Caching.ICacheManager)'. (See inner exception for details.) ---> System.MissingMethodException: Method not found: 'Void Nop.Web.Controllers.ProductController..ctor(Nop.Web.Factories.IProductModelFactory, Nop.Services.Catalog.IProductService, Nop.Core.IWorkContext, Nop.Core.IStoreContext, Nop.Services.Localization.ILocalizationService, Nop.Core.IWebHelper, Nop.Services.Catalog.IRecentlyViewedProductsService, Nop.Services.Catalog.ICompareProductsService, Nop.Services.Messages.IWorkflowMessageService, Nop.Services.Orders.IOrderReportService, Nop.Services.Orders.IOrderService, Nop.Services.Security.IAclService, Nop.Services.Stores.IStoreMappingService, Nop.Services.Security.IPermissionService, Nop.Services.Logging.ICustomerActivityService, Nop.Services.Events.IEventPublisher, Nop.Core.Domain.Catalog.CatalogSettings, Nop.Core.Domain.Orders.ShoppingCartSettings, Nop.Core.Domain.Localization.LocalizationSettings, Nop.Web.Framework.Security.Captcha.CaptchaSettings, Nop.Core.Caching.ICacheManager)'. at SevenSpikes.Nop.Plugins.QuickView.Controllers.QuickViewCatalogController.oZ4WEbrNyUcUmxN4r65(Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object , Object ) at SevenSpikes.Nop.Plugins.QuickView.Controllers.QuickViewCatalogController..ctor(IProductModelFactory productModelFactory, ICategoryService categoryService, IManufacturerService manufacturerService, IProductService productService, IVendorService vendorService, IProductTemplateService productTemplateService, IProductAttributeService productAttributeService, IWorkContext workContext, IStoreContext storeContext, ITaxService taxService, ICurrencyService currencyService, IPictureService pictureService, ILocalizationService localizationService, IMeasureService measureService, IPriceCalculationService priceCalculationService, IPriceFormatter priceFormatter, IWebHelper webHelper, ISpecificationAttributeService specificationAttributeService, IDateTimeHelper dateTimeHelper, IRecentlyViewedProductsService recentlyViewedProductsService, ICompareProductsService compareProductsService, IWorkflowMessageService workflowMessageService, IProductTagService productTagService, IOrderReportService orderReportService, IOrderService orderService, IAclService aclService, IStoreMappingService storeMappingService, IPermissionService permissionService, IDownloadService downloadService, ICustomerActivityService customerActivityService, IProductAttributeParser productAttributeParser, IShippingService shippingService, IEventPublisher eventPublisher, MediaSettings mediaSettings, CatalogSettings catalogSettings, VendorSettings vendorSettings, ShoppingCartSettings shoppingCartSettings, LocalizationSettings localizationSettings, CustomerSettings customerSettings, CaptchaSettings captchaSettings, SeoSettings seoSettings, ICacheManager cacheManager, QuickViewSettings quickViewSettings) at lambda_method(Closure , Object[] ) at Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() --- End of inner exception stack trace --- at Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters) at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) --- End of inner exception stack trace --- at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) at Autofac.Core.Resolving.InstanceLookup.Execute() at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters) at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters) at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance) at Autofac.ResolutionExtensions.ResolveOptionalService(IComponentContext context, Service service, IEnumerable`1 parameters) at Autofac.Integration.Mvc.AutofacDependencyResolver.GetService(Type serviceType) at System.Web.Mvc.DefaultControllerFactory.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) --- End of inner exception stack trace --- at System.Web.Mvc.DefaultControllerFactory.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) at System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) at System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)