Fatal error: Uncaught Error: Interface "Symfony\Component\Console\Command\SignalableCommandInterface" not found in /home/congngyh/pgairdc.org/vendor2/symfony/console/Command/InvokableCommand.php:31 Stack trace: #0 {main} thrown in /home/congngyh/pgairdc.org/vendor2/symfony/console/Command/InvokableCommand.php on line 31