Fatal error: Uncaught Error: Class "Symfony\Component\Notifier\Channel\AbstractChannel" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\notifier\Channel\ChatChannel.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\notifier\Channel\ChatChannel.php on line 22