Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Writer\Html' not found in /var/www/html/portal/phpspreadsheet_exc/src/PhpSpreadsheet/Writer/Pdf.php:10 Stack trace: #0 {main} thrown in /var/www/html/portal/phpspreadsheet_exc/src/PhpSpreadsheet/Writer/Pdf.php on line 10