Children of 'System.Windows.Controls.UIElementCollection' cannot be null. Object derived from UIElement expected

Question

I got this exception and don't know what to do with it. I'm using a TreeListView that I found on the net:

  <tv:TreeListView x:Name="listView" ItemsSource="{Binding TreeRoot}" Margin="5"      Width="640" Height="732">

    </tv:TreeListView>

Has anyone had this exception?

Answer 1

I suspect the TreeRoot collection in your DataContext contains null items.