.Net 4.5.2 itextSharp library convert HTML to PDF

Hi.

I have a simple project replace object html file inside my project folder which i want to convert to pdf and save to inside my folder project

but when i convert using iTextSharp i get error " The document has no pages." when try to

XMLWorkerHelper.GetInstance

public void SaveHtmlAsPdf(string htmlContent, string folderPath , string filename)
{
    try
    {
        // Ensure the folder exists, create if it doesn't
        if (!Directory.Exists(folderPath))
        {
            Directory.CreateDirectory(folderPath);
        }
 
        // Combine folder path and filename to get the full file path
        string pdfPath = Path.Combine(folderPath, filename);
 
        using (FileStream fs = new FileStream(pdfPath, FileMode.Create))
        {
            using (Document doc = new Document(PageSize.A4, 50, 50, 50, 50)) // Set page size and margins
            {
                PdfWriter writer = PdfWriter.GetInstance(doc, fs);
                doc.Open();
 
                // Convert HTML to PDF
                using (var sr = new StringReader(htmlContent))
                {
                    XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, sr);
                }
 
                doc.Close();
            }
        }
 
        Console.WriteLine("PDF saved successfully at: " + pdfPath);
    }
    catch (Exception ex)
    {
        Console.WriteLine("An error occurred while converting HTML to PDF: " + ex.Message);
        throw;
    }
}