Fatal error: Uncaught Error: Class 'Symfony\Component\Process\Exception\RuntimeException' not found in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/symfony/process/Exception/ProcessSignaledException.php:21 Stack trace: #0 {main} thrown in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/symfony/process/Exception/ProcessSignaledException.php on line 21