Fatal error: Uncaught Error: Class "Drupal\Core\Entity\EntityForm" not found in /home/qcsvlel/www/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php:19 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/field_ui/src/Form/EntityDisplayModeFormBase.php on line 19