Fatal error: Uncaught Error: Class "PhpOffice\PhpSpreadsheet\Exception" not found in C:\xampp\htdocs\xlsss\PhpSpreadsheet-master\src\PhpSpreadsheet\Writer\Exception.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\xlsss\PhpSpreadsheet-master\src\PhpSpreadsheet\Writer\Exception.php on line 7