Fatal error: Uncaught Error: Class "Drupal\migrate\Plugin\migrate\destination\EntityContentBase" not found in /home/www/drupal8/test/core/modules/comment/src/Plugin/migrate/destination/EntityComment.php:19 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/comment/src/Plugin/migrate/destination/EntityComment.php on line 19