Fatal error: Uncaught Error: Class 'SebastianBergmann\Comparator\ObjectComparator' not found in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/sebastian/comparator/src/DOMNodeComparator.php:21 Stack trace: #0 {main} thrown in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/sebastian/comparator/src/DOMNodeComparator.php on line 21