Fatal error: Uncaught Error: Class 'SebastianBergmann\Comparator\ObjectComparator' not found in /var/www/app/appregwebservice/vendor/sebastian/comparator/src/DOMNodeComparator.php:21 Stack trace: #0 {main} thrown in /var/www/app/appregwebservice/vendor/sebastian/comparator/src/DOMNodeComparator.php on line 21