Fatal error: Uncaught Error: Class "Drupal\Core\Entity\Entity\EntityFormDisplay" not found in /home/www/drupal8/test/core/modules/field_layout/src/Entity/FieldLayoutEntityFormDisplay.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/field_layout/src/Entity/FieldLayoutEntityFormDisplay.php on line 11