System.Exception: PDFClass constructor exception ---> WebSupergoo.ABCpdf9.Internal.PDFException: Unable to render HTML. Failed to configure IE 9 or above for the MSHtml engine: Access denied while writing to the registry. For IIS applications, please enable "Load User Profile" or consult MSHtmlBootstrap in the documentation.

Alternatively, you can configure this registry setting manually:
1. Create registry key "Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_IVIEWOBJECTDRAW_DMLT9_WITH_GDI" (which have to be under the Wow6432Node key if the running process is 32-bit on an x64 system; the current process is 64-bit).
2. In the created key, create a DWORD value named "w3wp.exe".
3. Set the DWORD's value to 1.
   at WebSupergoo.ABCpdf9.Doc.AddUrlHtml(String urlOrHtml, Boolean isHtml, Boolean paged, Int32 width, Boolean disableCache)
   at WebSupergoo.ABCpdf9.Doc.AddImageUrl(String url, Boolean paged, Int32 width, Boolean disableCache)
   at WebSupergoo.ABCpdf9.Doc.AddImageUrl(String url)
   at Dynamicweb.PDFClass..ctor(String strUrl, Boolean landscape, Boolean letter, Int32 leftRightMargin, Int32 topBottomMargin, PaperSize pageSize)
   --- End of inner exception stack trace ---
   at Dynamicweb.PDFClass..ctor(String strUrl, Boolean landscape, Boolean letter, Int32 leftRightMargin, Int32 topBottomMargin, PaperSize pageSize)
   at Dynamicweb.Frontend.PageView.Output()