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.Single(IEnumerable`1 source) +316
   System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__3(IEnumerable`1 sequence) +40
   System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle(IEnumerable`1 query, Expression queryRoot) +60
   System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute(Expression expression) +113
   System.Data.Entity.Internal.Linq.DbQueryProvider.Execute(Expression expression) +113
   System.Linq.Queryable.Single(IQueryable`1 source, Expression`1 predicate) +249
   DotNetPortal.Core.Business.ForumPostService.GetFirstPostOfThread(ForumThreadBO thread) in d:\Work\DotNetPortal\Current\src\DotNetPortal\DotNetPortal.Core\Business\ForumPostService.cs:85
   DotNetPortal.Core.Business.ForumThreadService.GetById(Int32 id) in d:\Work\DotNetPortal\Current\src\DotNetPortal\DotNetPortal.Core\Business\ForumThreadService.cs:88
   DotNetPortal.Web.ForumThread.FillControl() in d:\Work\DotNetPortal\Current\src\DotNetPortal\DotNetPortal.Web\ForumThread.aspx.cs:55
   DotNetPortal.Web.ForumThread.Page_Load(Object sender, EventArgs e) in d:\Work\DotNetPortal\Current\src\DotNetPortal\DotNetPortal.Web\ForumThread.aspx.cs:37
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +85
   System.Web.UI.Control.OnLoad(EventArgs e) +79
   System.Web.UI.Control.LoadRecursive() +130
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2853


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4690.0