x:Bind in windows 10 Mode One way : I am trying to update the bind list when scrollview reached to and end.

If i tried to use TwoWay mode, It shows below error: 
Error : Invalid binding path 'itemsList' : 
Cannot bind type 'System.Collections.Generic.List(System.String)' to 'System.Object' without a converter

My XAML code:<ScrollViewer
            x:Name="sv"
            ViewChanged="OnScrollViewerViewChanged"><ListBox x:Name="listView"
                HorizontalAlignment="Left"
                Height="Auto"
                VerticalAlignment="Top"
                Width="172"
                ItemsSource="{x:Bind itemsList, Mode=OneWay}"/></ScrollViewer>

My CS code:


   public List<String> itemsList = new List<string>();

     private void OnScrollViewerViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
                {
                    var verticalOffset = sv.VerticalOffset;
                    var maxVerticalOffset = sv.ScrollableHeight; //sv.ExtentHeight - sv.ViewportHeight;

                    if (maxVerticalOffset < 0 ||
                        verticalOffset == maxVerticalOffset)
                    {
                        // Scrolled to bottom

                        Util.debugLog("REACHED BOTTOM");
                        int i;
                        //   itemsList = null;
                        itemsList.Clear();
                        for (i = 0; i < 20; i++)
                        {
                            itemsList.Add("Item number " + i + 900);
                        }

                    }
                    else
                    {
                        // Not scrolled to bottom
                        //   rect.Fill = new SolidColorBrush(Colors.Yellow);
                    }
                }