ScreenCaptureException Constructor(string)

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ScreenCapture; 
 
 
void scEngine_CaptureInformation(object sender, ScreenCaptureInformationEventArgs e) 
{ 
   // Make sure that the image was captured successfully 
   Debug.Assert(e.Image != null); 
 
   // Define codecs class object to save the image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   // Save the resulted Image 
   codecs.Save(e.Image, Path.Combine(LEAD_VARS.ImagesDir, "Out_CapturedImage.bmp"), RasterImageFormat.Bmp, 24); 
 
 
   // NOTE: e.Information is a ScreenCaptureInformation structure filled with information 
   // about the captured image, this information can be used here 
   // Display a MessageBox with the bounds of the capture area 
   MessageBox.Show("Captured Area Bounds:\n" + 
      "Top:" + e.Information.Area.Top.ToString() + "\n" + 
      "Left:" + e.Information.Area.Left.ToString() + "\n" + 
      "Right:" + e.Information.Area.Right.ToString() + "\n" + 
      "Bottom:" + e.Information.Area.Bottom.ToString()); 
 
   // everything worked fine 
   e.Cancel = false; 
} 
 
public void ScreenCaptureExceptionExample() 
{ 
   ScreenCaptureEngine.Startup(); 
   ScreenCaptureEngine scEngine = new ScreenCaptureEngine(); 
   ScreenCaptureInformation captureInformation = null; 
   scEngine.CaptureInformation += new EventHandler<ScreenCaptureInformationEventArgs>(scEngine_CaptureInformation); 
 
   try 
   { 
      MessageBox.Show("After you close this message box,\npress F11 to capture the wallpaper."); 
      RasterImage image = scEngine.CaptureWallpaper(captureInformation); 
   } 
   catch (ScreenCaptureException ex) 
   { 
      //LEADTOOLS ScreenCapture Error 
      MessageBox.Show(string.Format("Could not capture wallpaper.{0}ScreenCapture error code: {1}{0}Message: {2}", Environment.NewLine, ex.Code, ex.Message)); 
   } 
   catch (Exception ex) 
   { 
      // Other errors 
      MessageBox.Show(string.Format("Could not capture wallpaper.{0}{1}", Environment.NewLine, ex.Message)); 
   } 
   ScreenCaptureEngine.Shutdown(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}