Server Error in '/' Application.

Sequence contains no elements

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Sequence contains no elements

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidOperationException: Sequence contains no elements]
   System.Linq.Enumerable.First(IEnumerable`1 source) +405
   Umbraco.Core.Configuration.UmbracoSettings.ContentErrorsElement.get_Error404Collection() +118
   Umbraco.Web.Routing.ContentFinderByLegacy404.TryFindContent(PublishedContentRequest pcr) +648
   Umbraco.Web.Routing.ContentLastChanceFinderByNotFoundHandlers.HandlePageNotFound(PublishedContentRequest docRequest) +586
   Umbraco.Web.Routing.ContentLastChanceFinderByNotFoundHandlers.TryFindContent(PublishedContentRequest docRequest) +16
   Umbraco.Web.Routing.PublishedContentRequestEngine.HandlePublishedContent() +610
   Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContentAndTemplate() +354
   Umbraco.Web.Routing.PublishedContentRequestEngine.PrepareRequest() +124
   Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext) +475
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +139
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3163.0