Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Writer\BaseWriter" not found in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/Writer/Html.php:33 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/Writer/Html.php on line 33