Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Calculation\Database\DatabaseAbstract' not found in /srv/disk3/4464330/www/back.ticket-el.com/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Database/DSum.php:7 Stack trace: #0 {main} thrown in /srv/disk3/4464330/www/back.ticket-el.com/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Database/DSum.php on line 7