2010 Vol 2, 3.5 library

I get the error: Data at the root level is invalid. Line 1, position 1.

I created a new app. Copied the dock manager xaml from your first dockmanager sample. Also, I gave the splitpanes a unique name. I added ONLY the following code:

 public MainWindow()
{
InitializeComponent();
//
this.Closed += new EventHandler(MainWindow_Closed);
this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
}
<
void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
if (File.Exists("layout.xml")) { this.DockManager.LoadLayout("layout.xml");
}
}
void MainWindow_Closed(object sender, EventArgs e)
{
using (FileStream fs = new FileStream("layout.xml", FileMode.Create, FileAccess.Write))
{
this.DockManager.SaveLayout(fs);
}
}

The xml file being created is:

<?xml version="1.0" encoding="utf-8"?>
<xamDockManager version="10.2.20102.1014">
  <contentPanes>
    <contentPane name="leftEdgeDock" location="DockedLeft" />
    <contentPane name="rightEdgeDock" location="DockedRight" />
  </contentPanes>
  <panes>
    <splitPane name="SplitPane1" splitterOrientation="Vertical" location="DockedLeft">
      <contentPane name="leftEdgeDock" />
    </splitPane>
    <splitPane name="SplitPane2" splitterOrientation="Vertical" location="DockedRight">
      <contentPane name="rightEdgeDock" />
    </splitPane>
  </panes>
</xamDockManager>