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Hello!This code creates a corrupted file. 
What could be the problem? 

require_once 'classes/CreateDocx.php';
$docx = new CreateDocx();
$math = new WordFragment($docx);
$math->addMathEquation(
'<m:oMathPara>
       <m:oMath><m:r><m:t>∪±∞=~×</m:t></m:r></m:oMath>
   </m:oMathPara>', 'omml'
);
$valuesTable = array(
    array(
        $math,
    )
);
$docx->addTable($valuesTable);
$docx->createDocx('output');