Fatal error: Uncaught Error: Class 'PHPExcel_Writer_Abstract' not found in /var/www/html/ovunque-si/mose/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php:36
Stack trace:
#0 {main}
thrown in /var/www/html/ovunque-si/mose/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel2007.php on line 36