ITextSharp XMLWorkerHelper Not Working

Question

I am trying to convert an HTML page to PDF. I am trying to utilize the XMLWorker. I am following various examples I see around the web. For some reason, however, the XMLWorkerHelper object seems to think that my PDFWriter object is actually an IElementHandler object. Because of this, it won't compile. I don't know what is wrong. Has anyone experienced this? How do I convince the XMLWorkerHelper that my PDFWriter is in fact a PDFWriter? Here is my code:

Imports System.IO
Imports iTextSharp.text
Imports iTextSharp.text.pdf
Imports iTextSharp.tool.xml


    Dim bytes As Byte()

    Using ms = New MemoryStream
        Using doc = New Document
            Using writer = PdfWriter.GetInstance(doc, ms)

                doc.Open()

                Using msCSS As New MemoryStream(System.Text.Encoding.UTF8.GetBytes(CSSstr))
                    Using msHTML As New MemoryStream(System.Text.Encoding.UTF8.GetBytes(HTMLstr))

                       'This Doesn't Work...
                       iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msHTML, msCSS)

                    End Using
                End Using

                doc.Close()

            End Using
        End Using

        bytes = ms.ToArray

    End Using

Answer 1

Thanks to Bruno, I was able to get it working. As Bruno pointed out, the version numbers of iTextSharp and XMLWorker need to be identical. I was apparently using an older version if iTextSharp. I downloaded the latest version and the problem went away.