Fatal error: Uncaught Error: Class 'Symfony\Component\Console\Event\ConsoleEvent' not found in D:\xampp\htdocs\psp\backend\vendor\symfony\console\Event\ConsoleSignalEvent.php:21 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\symfony\console\Event\ConsoleSignalEvent.php on line 21