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Hi. I am on Siteground with this plugin, I used the column headers from the export and get this error. However, it does add the question and content but not the category or tags even when the error occurs.
Fatal error: Call to undefined method PHPExcel_Calculation::unsetInstance() in /home/ever/eversity.uasys.edu/htdocs/aa.eversity.uasys.edu/wp-content/plugins/ultimate-faqs/PHPExcel/Classes/PHPExcel.php on line 390