Server Error in '/Normelombardia' Application.

Object reference not set to an instance of an object.

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.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 4149:            TreeViewAccessibile tree = (TreeViewAccessibile)Session["treedata"];
Line 4150:            // Apro l'albero alla posizione corretta
Line 4151:            tree.apriAlberoFinoANodo(parteTrovata.IdParte);
Line 4152:            // Se l'id è di un intero documento visualizza il sommario
Line 4153:            if (idXNorme.Length == 17) Response.Redirect("main.aspx?view=showdoc&selnode=" + parteTrovata.IdSup + "&iddoc=" + parteTrovata.IdParte);

Source File: \\file01\nir$\accessibile\main.aspx.cs    Line: 4151

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   accessibile_main.decodificaURN(String urn) in \\file01\nir$\accessibile\main.aspx.cs:4151
   accessibile_main.Page_Load(Object sender, EventArgs e) in \\file01\nir$\accessibile\main.aspx.cs:284
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1055.0