Opening html documents as pdf

Hello, We have recently purchased Aspose.Total (14.10) and we are using it to open html files as pdfs using New Aspose.Pdf.Document(filename, htmlloadoptions). On a very minute few we are getting the exception ['<' is an unexpected token. The expected token is ';'. Line 882, position 63] thrown and was wondering where and how to debug this. Is the error in the software (Aspose) or is it in the html text. What does the error mean? Iam developing using VB.Net. I have played around with trying to open the same files with Aspose.Words but the text is way too large in excess of font size 200 in some cases and the pdf route is the only one that has some semblance of a good representation of the html source file. Regards William