Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in C:\xampp\htdocs\slip\Warranty-UploadFile\vendor\symfony\mailer\Event\FailedMessageEvent.php:20
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\slip\Warranty-UploadFile\vendor\symfony\mailer\Event\FailedMessageEvent.php on line 20