Fatal error: Uncaught Error: Class 'PhpOffice\PhpSpreadsheet\Cell\DefaultValueBinder' not found in C:\xampp\htdocs\gpao_prod\app\Exports\NomenclaturesTreeExport.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\gpao_prod\app\Exports\NomenclaturesTreeExport.php on line 18