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) +335
   Umbraco.Core.Configuration.UmbracoSettings.ContentErrorsElement.get_Error404Collection() +98
   Umbraco.Core.Configuration.UmbracoSettings.ContentElement.get_Error404Collection() +17
   Umbraco.Web.Routing.ContentFinderByLegacy404.TryFindContent(PublishedContentRequest pcr) +98
   Umbraco.Web.Routing.ContentFinderByNotFoundHandlers.HandlePageNotFound(PublishedContentRequest docRequest) +563
   Umbraco.Web.Routing.ContentFinderByNotFoundHandlers.TryFindContent(PublishedContentRequest docRequest) +10
   Umbraco.Web.Routing.PublishedContentRequestEngine.<FindPublishedContent>b__28(IContentFinder finder) +15
   System.Linq.Enumerable.Any(IEnumerable`1 source, Func`2 predicate) +148
   Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContent() +240
   Umbraco.Web.Routing.PublishedContentRequestEngine.FindPublishedContentAndTemplate() +217
   Umbraco.Web.Routing.PublishedContentRequestEngine.PrepareRequest() +107
   Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext) +379
   Umbraco.Web.UmbracoModule.<Init>b__8(Object sender, EventArgs e) +80
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +198
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +109
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +73


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.9214.0