Fatal error: Uncaught Error: Class "Symfony\Component\Mailer\Exception\RuntimeException" not found in D:\xampp\htdocs\dropifypro\vendor\symfony\mailer\Exception\TransportException.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\dropifypro\vendor\symfony\mailer\Exception\TransportException.php on line 17