Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Writer\Xls\BIFFwriter" not found in D:\xampp\htdocs\vendor\phpoffice\phpspreadsheet\Writer\Xls\Workbook.php:49 Stack trace: #0 {main} thrown in D:\xampp\htdocs\vendor\phpoffice\phpspreadsheet\Writer\Xls\Workbook.php on line 49