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:


Line 746:        public XElement ReadItemNode(XElement rootNode, string tagName, string id)
Line 747:        {
Line 748:            return (from itemNode in rootNode.Descendants(tagName)
Line 749:                    where id.Equals(GetAttribute(itemNode, "id"), StringComparison.InvariantCultureIgnoreCase)
Line 750:                    select itemNode).Single();

Source File: c:\Sites\mimsites\mechanismsinmedicine1\App_Code\Lcms\CmsData\CmsData.cs    Line: 748

Stack Trace:


[InvalidOperationException: Sequence contains no elements]
   System.Linq.Enumerable.Single(IEnumerable`1 source) +306
   CmsData.ReadItemNode(XElement rootNode, String tagName, String id) in c:\Sites\mimsites\mechanismsinmedicine1\App_Code\Lcms\CmsData\CmsData.cs:748
   CmsData.readItem(XElement rootNode, String tagName, String id) in c:\Sites\mimsites\mechanismsinmedicine1\App_Code\Lcms\CmsData\CmsData.cs:732
   CmsData.ReadItem(String fileName, String tagName, String id) in c:\Sites\mimsites\mechanismsinmedicine1\App_Code\Lcms\CmsData\CmsData.cs:704
   ASP._Page_site_view_cshtml.Execute() in c:\Sites\mimsites\mechanismsinmedicine1\site\view.cshtml:56
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252
   System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable`1 executors) +99
   System.Web.WebPages.WebPage.ExecutePageHierarchy() +182
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +107
   System.Web.WebPages.WebPageHttpHandler.ProcessRequestInternal(HttpContextBase httpContext) +142


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3930.0