Server Error in '/' Application.

Value cannot be null.
Parameter name: source

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.ArgumentNullException: Value cannot be null.
Parameter name: source

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:


[ArgumentNullException: Value cannot be null.
Parameter name: source]
   System.Linq.Enumerable.Where(IEnumerable`1 source, Func`2 predicate) +6295858
   Dynamicweb.Frontend.XmlNavigation.MakeXml(Int32 parentId, Int32 levelStart, Int32 levelStop, Expand expand, Int32 selectedAreaId) +965
   Dynamicweb.Frontend.XmlNavigation.GetNavigationHtml(Int32 parentId, Int32 levelStart, Int32 levelStop, Expand expand, String name, String xsltPath, Int32 selectedAreaId, Boolean sitemapMode, NameValueCollection settings, NameValueCollection attributes, IncludeMode mode) +239
   Dynamicweb.Frontend.XmlNavigation.GetNavigationHtml(NameValueCollection settings, NameValueCollection attributes) +1727
   Dynamicweb.Frontend.XmlNavigation.ParseNavigationTags(Template template, Layout layout) +160
   Dynamicweb.Frontend.Renderer.RenderPage(Template template, PageViewModel pageViewModel) +3089
   Dynamicweb.Frontend.PageView.SetPageTemplateValues() +222
   Dynamicweb.Frontend.PageView.Output() +1159
   Dynamicweb.AspNet.DynamicwebHttpHandler.ProcessRequest(HttpContext context) +71
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +542
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +93


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0