Fatal error: Uncaught Error: Class 'PHPExcel_Writer_Abstract' not found in /home/admin2bannerworl/public_html/admin2.bannerworld.co.uk/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/OpenDocument.php:28 Stack trace: #0 {main} thrown in /home/admin2bannerworl/public_html/admin2.bannerworld.co.uk/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/OpenDocument.php on line 28