Fatal error: Uncaught Error: Class "Symfony\Component\Console\Event\ConsoleEvent" not found in C:\xampp\htdocs\slip\Warranty-UploadFile\vendor\symfony\console\Event\ConsoleErrorEvent.php:23 Stack trace: #0 {main} thrown in C:\xampp\htdocs\slip\Warranty-UploadFile\vendor\symfony\console\Event\ConsoleErrorEvent.php on line 23