Fatal error: Uncaught Error: Class "Symfony\Component\Console\Event\ConsoleEvent" not found in /home/tubu/public_html/Drupal_CMS/cms/vendor/symfony/console/Event/ConsoleErrorEvent.php:23 Stack trace: #0 {main} thrown in /home/tubu/public_html/Drupal_CMS/cms/vendor/symfony/console/Event/ConsoleErrorEvent.php on line 23