Fatal error: Uncaught Error: Class "Drupal\Core\Entity\EntityConfirmFormBase" not found in /home/qcsvlel/www/core/modules/workspaces/src/Form/WorkspaceActivateForm.php:18 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/workspaces/src/Form/WorkspaceActivateForm.php on line 18