Covert HTML with PhpWord: error - DOMDocument::loadXML(): Namespace prefix o on p is not defined in Entity

I am trying to covert HTML formatted with Php word.

I created an html form with summernote. Summernote allows the user to format text. This text is saved to the database with html tags.

Next using phpWord, I would like to output the captured information into a word document. Please see the code below:

$rational = DB::table('rationals')->where('qualificationheader_id',$qualId)->value('rational');

 $wordTest = new \PhpOffice\PhpWord\PhpWord();
        $newSection = $wordTest->addSection();
        $newSection->getStyle()->setPageNumberingStart(1);


    \PhpOffice\PhpWord\Shared\Html::addHtml($newSection,$rational);
    $footer = $newSection->addFooter();
    $footer->addText($curriculum->curriculum_code.'-'.$curriculum->curriculum_title);



    $objectWriter = \PhpOffice\PhpWord\IOFactory::createWriter($wordTest,'Word2007');
    try {
        $objectWriter->save(storage_path($curriculum->curriculum_code.'-'.$curriculum->curriculum_title.'.docx'));
    } catch (Exception $e) {
    }

    return response()->download(storage_path($curriculum->curriculum_code.'-'.$curriculum->curriculum_title.'.docx'));

I get the error below:

ErrorException (E_WARNING) DOMDocument::loadXML(): Namespace prefix o on p is not defined in Entity, line: 1

from Covert HTML with PhpWord: error - DOMDocument::loadXML(): Namespace prefix o on p is not defined in Entity