PDF 2 HTML Error

//open documentDocument pdfDocument = new Document("input.pdf");//create TextAbsorber object to find all instances of the input search phraseTextFragmentAbsorber textFragmentAbsorber = new TextFragmentAbsorber("\\d{4}-\\d{4}"); //like 1999-2000//set text search option to specify regular expression usageTextSearchOptions textSearchOptions = new TextSearchOptions(true);
textFragmentAbsorber.TextSearchOptions = textSearchOptions;//accept the absorber for all the pagespdfDocument.Pages.Accept(textFragmentAbsorber);//get the extracted text fragmentsTextFragmentCollection textFragmentCollection = textFragmentAbsorber.TextFragments;//loop through the fragmentsforeach (TextFragment textFragment in textFragmentCollection)
{//update text and other propertiestextFragment.Text = "New Phrase";
set to an instance of an object.
textFragment.TextState.Font = FontRepository.FindFont("Verdana");
textFragment.TextState.FontSize = 22;
textFragment.TextState.ForegroundColor = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Blue);
textFragment.TextState.BackgroundColor = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Green);
}

  HtmlSaveOptions htmlOptions = new HtmlSaveOptions();
            htmlOptions.FixedLayout = true;
            htmlOptions.FontSavingMode = HtmlSaveOptions.FontSavingModes.AlwaysSaveAsTTF;
            htmlOptions.RasterImagesSavingMode = HtmlSaveOptions.RasterImagesSavingModes.AsEmbeddedPartsOfPngPageBackground;

pdfDocument.Save("output.html",htmlOptions);

Please reply As soon as possible.

Thanks,

Jignesh Chauhan