Fatal error: Uncaught Error: Class "Drupal\Core\Entity\Form\DeleteMultipleForm" not found in /home/www/drupal8/test/core/modules/comment/src/Form/ConfirmDeleteMultiple.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/comment/src/Form/ConfirmDeleteMultiple.php on line 13