Error during PDF post processing in HtmlToPDF

Hi,
I am using Web services interface to convert Html document to PDF. Works fine for simple html documents stored locally. However when using a remote html document (for example the one in the quickstart--http://www.adobe.com--I am getting an exception:
ALC-PDG-16003-16003-000: com.adobe.livecycle.generatedpdf.client.ConversionException: ALC-PDG-016-003-An unknown/unexpected error occurred during PDF post-processing.

I get the same error when trying this conversion from the Administration Console. I am using JBoss/turnkey. I do not have Adobe Acrobat running on the server computer.

Thanks,
Jesse