Fatal error: Uncaught Error: Class 'Symfony\Component\Mailer\Transport\AbstractTransport' not found in E:\xampp\htdocs\www\qr250\vendor\symfony\mailer\Transport\SendmailTransport.php:34 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\qr250\vendor\symfony\mailer\Transport\SendmailTransport.php on line 34