Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Style\Supervisor" not found in /itss/home/arcelormittal/public_html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Color.php:5 Stack trace: #0 {main} thrown in /itss/home/arcelormittal/public_html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Style/Color.php on line 5