Fatal error: Uncaught Error: Class "Drupal\webform\Form\WebformConfigEntityDeleteFormBase" not found in /home/www/drupal8/test/modules/webform/src/WebformOptionsDeleteForm.php:10 Stack trace: #0 {main} thrown in /home/www/drupal8/test/modules/webform/src/WebformOptionsDeleteForm.php on line 10