Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Style\Supervisor" not found in D:\Apache24\www\dls\back-end\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Style\Style.php:11 Stack trace: #0 {main} thrown in D:\Apache24\www\dls\back-end\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Style\Style.php on line 11