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Error using PHP to read XLSX file created on Mac OS


This question relates to importing an XLSX file. If I create the file in Windows and import it using the PHPExcel library, it is working fine. But, if I create the file on a Mac, it throws an error:
Message: Call to a member function registerXPathNamespace() on boolean
Filename: excelreader\PHPExcel\Reader\Excel2007.php
Line Number: 462