Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Style\Supervisor' not found in /var/www/html/portal/phpspreadsheet_exc/src/PhpSpreadsheet/Style/Border.php:7 Stack trace: #0 {main} thrown in /var/www/html/portal/phpspreadsheet_exc/src/PhpSpreadsheet/Style/Border.php on line 7