Fatal error: Uncaught Error: Class 'Symfony\Component\Console\Helper\Helper' not found in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/symfony/console/Helper/InputAwareHelper.php:22 Stack trace: #0 {main} thrown in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/symfony/console/Helper/InputAwareHelper.php on line 22