Fatal error: Uncaught Error: Class "Drupal\Core\Form\ConfirmFormBase" not found in /home/qcsvlel/www/core/modules/workflows/src/Form/WorkflowStateDeleteForm.php:15 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/workflows/src/Form/WorkflowStateDeleteForm.php on line 15