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I'm trying to replace a template variable with a pagenumber, but I'm getting a strange error (not what I would expect).

Stacktrace: https://s1.postimg.org/yhv6iiycd/Knipsel.png

From the docs:

// create a Word fragment to insert in the default header
$numbering = new WordFragment($docx, 'defaultHeader');
// set some formatting options
$options = array('textAlign' => 'right',
'bold' => true,
'sz' => 14,
'color' => 'B70000',
);
$numbering->addPageNumber('numerical', $options);
$docx->addHeader(array('default' => $numbering));

My implementation: (where $this is an instance of CreateDocxFromTemplate)

  function addPageNumberingToDocument()
    {
        // create a Word fragment
        $numbering = new WordFragment($this);
        $options = [
            'textAlign' => 'right',
            'bold' => false,
            'sz' => 14,
            'color' => '000000'
        ];
        $numbering->addPageNumber('numerical', $options);

        // Replace variables(pagenumber) in header and footer
        $this->replaceVariableByWordFragment(['pagenumber' => $numbering], ['target' => 'header']);
        $this->replaceVariableByWordFragment(['pagenumber' => $numbering], ['target' => 'footer']);

    }

How should I go about replacing a variable with a pagenumber?