Fatal error: Uncaught Error: Class 'Symfony\Component\Console\Event\ConsoleEvent' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\console\Event\ConsoleCommandEvent.php:19 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\console\Event\ConsoleCommandEvent.php on line 19