Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Reader\XlsBase" not found in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/Reader/Xls.php:63 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/src/PhpSpreadsheet/Reader/Xls.php on line 63