Fatal error: Uncaught Error: Class "Drupal\Core\Form\FormBase" not found in /home/qcsvlel/www/core/modules/user/src/Form/RoleSettingsForm.php:14 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/user/src/Form/RoleSettingsForm.php on line 14