Server Error in '/' 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:

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:


[NullReferenceException: Object reference not set to an instance of an object.]
   WebPartGroupMenu.<>c.<Page_Load>b__42_3(fce_sales_item_sales_item_group ex) in C:\Programming\PintorProject.Platform\WebParts\WebPartGroupMenu\main.ascx.cs:197
   System.Linq.WhereSelectEnumerableIterator`2.MoveNext() +164
   System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source) +183
   WebPartGroupMenu.main.Page_Load(Object sender, EventArgs e) in C:\Programming\PintorProject.Platform\WebParts\WebPartGroupMenu\main.ascx.cs:195
   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.Control.LoadRecursive() +200
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2849


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2623.0