RDFUtil.php function writeHtmlTable line 180:
echo INDENTATION . '<tr bgcolor="' . HTML_TABLE_HEADER_COLOR . '">' . LINEFEED . INDENTATION . INDENTATION . '<td td width="68%" colspan="3">';
The <td> tag is not well-formed: <td td (<td).
Then, at line 204:
echo INDENTATION . '<tr bgcolor="' . HTML_TABLE_HEADER_COLOR . '">' . LINEFEED . INDENTATION . INDENTATION . '<td width="4%"><p align=center><b>No.</b></p></td>' . LINEFEED . INDENTATION . INDENTATION . '<td width="32%"><p><b>Subject</b></p></td>' . LINEFEED . INDENTATION . INDENTATION . '<td width="32%"><p><b>Predicate</b></p></td>' . LINEFEED . INDENTATION . INDENTATION . '<td width="32%"><p><b>Object</b></p></td>' . LINEFEED . INDENTATION . '</tr>' . LINEFEED;
Paragraph alignment attribute value needs to be quoted <p align=center (<p align="center"). Same again at line 210, and also here there is an uppercase, unclosed tag: <BR> (<br/>).