Fatal error: Uncaught Error: Class 'Symfony\Component\Notifier\Channel\AbstractChannel' not found in C:\xampp\htdocs\ApiSigestWin\vendor\symfony\notifier\Channel\ChatChannel.php:25 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\vendor\symfony\notifier\Channel\ChatChannel.php on line 25