Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Style\Supervisor' not found in /opt/lampp/htdocs/kuesioner/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Borders.php:7 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Borders.php on line 7