Fatal error: Uncaught Error: Class 'Symfony\Component\Mailer\Exception\TransportException' not found in C:\xampp\htdocs\plugins\Symfony\Component\Mailer\Exception\UnexpectedResponseException.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\Mailer\Exception\UnexpectedResponseException.php on line 14