Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Exception' not found in /var/www/html/portal/vendor/PhpOffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Exception.php:7 Stack trace: #0 {main} thrown in /var/www/html/portal/vendor/PhpOffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Exception.php on line 7