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 70:                         Dim catID As String = parts(0)
Line 71:                         Dim onderwijsstructuur As String = parts(1)
Line 72:                         litWerkgroep.Text = db.tblRichtingCategorie.Where(Function(c) c.categorieID = catID).First.naam & " / " & db.tblRichting.Where(Function(c) c.richtingID = onderwijsstructuur).First.naam
Line 73:                     Else
Line 74:                         Dim catID As String = parts(0)

Source File: D:\inetpub\wwwroot\cnosite\components\cno_inschrijven\cno_inschrijven.ascx.vb    Line: 72

Stack Trace:


[InvalidOperationException: Sequence contains no elements]
   System.Linq.Enumerable.First(IEnumerable`1 source) +417
   components_cno_inschrijven_cno_inschrijven.Page_Load(Object sender, EventArgs e) in D:\inetpub\wwwroot\cnosite\components\cno_inschrijven\cno_inschrijven.ascx.vb:72
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4494.0