Unhandled Error in Silverlight Application Object reference not set to an instance of an object

2 posts, 0 answers
  1. Vlad
    Vlad avatar
    19 posts
    Member since:
    Nov 2010

    Posted 29 Jun 2011 Link to this post

    I am getting a very strange error that I cannot resolve:

    Message: Unhandled Error in Silverlight Application Object reference not set to an instance of an object.   at Telerik.Windows.Controls.RadBook.OnCurrentSheetIndexChanged(Int32 newValue, Int32 oldValue)
       at Telerik.Windows.Controls.RadBook.OnRightPageIndexChanged(Int32 rightPageIndex)
       at Telerik.Windows.Controls.RadBook.OnRightPageIndexPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at Telerik.Windows.PropertyMetadata.<>c__DisplayClass1.<Create>b__0(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
       at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
       at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet)
       at Telerik.Windows.Controls.RadBook.set_RightPageIndex(Int32 value)
       at HotmailBackToSchool.MainPage.OpenTipPage1(Object sender, RoutedEventArgs e)
       at System.Windows.Controls.Primitives.ButtonBase.OnClick()
       at System.Windows.Controls.Button.OnClick()
       at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
       at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
       at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

    My code is pretty basic. I cannot find anything wrong in here:


    void OpenPage1(object sender, System.Windows.RoutedEventArgs e)


     this.Book.RightPageIndex = 1;


     It happens while the app in RightPageIndex = 11, RightPageIndex = 9, or RightPageIndex = 7 and I cleck a button to open forst page.
    I tried suggested fix from other post:




    .Dispatcher.BeginInvoke(new Action(() => { Book.RightPageIndex = 1; }));


    It does not solve this issue. I am wondering if it is possible to fix. Please help. Thank you in advance!
  2. Petar Mladenov
    Petar Mladenov avatar
    2986 posts

    Posted 01 Jul 2011 Link to this post

    Hi Vlad,

    I am unable to reproduce this issue. Could you please examine my test project and let me know if I have missed something? You can also modify it so that it shows the problem. Thank you in advance for your cooperation.

    Best wishes,
    Petar Mladenov
    the Telerik team
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