Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Writer\Xlsx\WriterPart' not found in C:\xampp7\htdocs\edgpens\extension\PhpSpreadsheet-master\src\PhpSpreadsheet\Writer\Xlsx\DocProps.php:10 Stack trace: #0 {main} thrown in C:\xampp7\htdocs\edgpens\extension\PhpSpreadsheet-master\src\PhpSpreadsheet\Writer\Xlsx\DocProps.php on line 10