Fatal error: Uncaught Error: Class "Symfony\Component\Console\Command\Command" not found in /home/qcsvlel/www/core/lib/Drupal/Core/Command/GenerateProxyClassCommand.php:17 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/lib/Drupal/Core/Command/GenerateProxyClassCommand.php on line 17