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