Fatal error: Uncaught Error: Class 'Symfony\Component\RemoteEvent\Event\Mailer\AbstractMailerEvent' not found in C:\xampp\htdocs\plugins\Symfony\Component\RemoteEvent\Event\Mailer\MailerEngagementEvent.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\RemoteEvent\Event\Mailer\MailerEngagementEvent.php on line 17