title: 'System.IO.FileNotFoundException'
body: <p>'System.IO.FileNotFoundException' occurred in MyApp.DLL</p>
  
  <p>The C# codes are following. The error Pointer was indicating on LockScreen.SetImageUri(uri) "this is the next statement that will be executed".</p>
  
  <pre><code>public partial class MainPage : PhoneApplicationPage
  {
      // Constructor
      public MainPage()
      {
          InitializeComponent();
      }
  
  
      private async void SetBackground1(object sender, RoutedEventArgs e)
      {
          if (await LockScreenManager.RequestAccessAsync() == LockScreenRequestResult.Granted)
          {
              var uri = new Uri("ms-appx:///Assets/1.jpg", UriKind.Absolute);
              LockScreen.SetImageUri(uri);
          }
          else
          {
              MessageBox.Show("You said no, so I can't update your background.");
          }
      }
  }
  </code></pre>