</a> to validate your
          FO document. This will catch most problems, but should not be
          relied upon to catch all.
        </p>
<p>
          If you use XSLT, problems in your style sheet and in your source XML
          also can produce a NullPointerException. Run the transformation
          separately to check for this, usually you'll get a detailed error
          message from the XSLT processor.
        </p>
<p>
          If you turn on debugging with the "-d" option you may be able to
 