Fatal error: Uncaught Error: Class "Symfony\Component\Console\Event\ConsoleEvent" not found in /users/ms-it/www/oc/lib/composer/symfony/console/Event/ConsoleCommandEvent.php:21 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/symfony/console/Event/ConsoleCommandEvent.php on line 21