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[IOS Version ]TreeView IndexOutRangeException Error 

<ContentPage xmlns:syncfusion="clr-namespace:Syncfusion.XForms.TreeView;assembly=Syncfusion.SfTreeView.XForms"
             xmlns:treeviewengine="clr-namespace:Syncfusion.TreeView.Engine;assembly=Syncfusion.SfTreeView.XForms">
    <ContentPage.Content>
       <syncfusion:SfTreeView x:Name="treeView">
            <syncfusion:SfTreeView.Nodes>
                <treeviewengine:TreeViewNode Content="Australia">
                    <treeviewengine:TreeViewNode.ChildNodes>
                        <treeviewengine:TreeViewNode Content="New South Wales">
                            <treeviewengine:TreeViewNode.ChildNodes>
                                <treeviewengine:TreeViewNode Content="Sydney"/>
                            </treeviewengine:TreeViewNode.ChildNodes>  
                        </treeviewengine:TreeViewNode>
                    </treeviewengine:TreeViewNode.ChildNodes>
                </treeviewengine:TreeViewNode>
                <treeviewengine:TreeViewNode Content="United States of America">
                    <treeviewengine:TreeViewNode.ChildNodes>
                        <treeviewengine:TreeViewNode Content="New York"/>
                        <treeviewengine:TreeViewNode Content="California">
                            <treeviewengine:TreeViewNode.ChildNodes>
                                <treeviewengine:TreeViewNode Content="San Francisco"/>
                            </treeviewengine:TreeViewNode.ChildNodes>
                        </treeviewengine:TreeViewNode>
                    </treeviewengine:TreeViewNode.ChildNodes>
                </treeviewengine:TreeViewNode>
            </syncfusion:SfTreeView.Nodes>
        </syncfusion:SfTreeView>
    </ContentPage.Content>
</ContentPage>