[nrms?]

Sorry ... I'll resurrect this topic ...
For anyone who is having errors like this

Fatal error: Call to undefined function convert_wysiwyg_html_to_bbcode()

Go to the location indicated and replace

$bodytext = convert_wysiwyg_html_to_bbcode($vbulletin->GPC['message']);

by

require_once(DIR . '/includes/class_wysiwygparser.php');
$html_parser = new vB_WysiwygHtmlParser($vbulletin);
$bodytext = $html_parser->parse_wysiwyg_html_to_bbcode($vbulletin->GPC['message']);

That's how I solved my problem.