[InvalidOperationException: Sequence contains no elements]
System.Linq.Enumerable.First(IEnumerable`1 source) +455
Umbraco.Core.Configuration.UmbracoSettings.ContentErrorsElement.get_Error404Collection() in d:\a\1\s\src\Umbraco.Core\Configuration\UmbracoSettings\ContentErrorsElement.cs:13
Umbraco.Web.Routing.ContentFinderByConfigured404.TryFindContent(PublishedRequest frequest) in d:\a\1\s\src\Umbraco.Web\Routing\ContentFinderByConfigured404.cs:57
Umbraco.Web.Routing.PublishedRouter.HandlePublishedContent(PublishedRequest request) in d:\a\1\s\src\Umbraco.Web\Routing\PublishedRouter.cs:459
Umbraco.Web.Routing.PublishedRouter.FindPublishedContentAndTemplate(PublishedRequest request) in d:\a\1\s\src\Umbraco.Web\Routing\PublishedRouter.cs:401
Umbraco.Web.Routing.PublishedRouter.PrepareRequest(PublishedRequest request) in d:\a\1\s\src\Umbraco.Web\Routing\PublishedRouter.cs:135
Umbraco.Web.UmbracoInjectedModule.ProcessRequest(HttpContextBase httpContext) in d:\a\1\s\src\Umbraco.Web\UmbracoInjectedModule.cs:159
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +194
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +220
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +94