Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart' not found in /var/www/html/portal/vendora/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Theme.php:8 Stack trace: #0 {main} thrown in /var/www/html/portal/vendora/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx/Theme.php on line 8