Fatal error: Uncaught Error: Class "Drupal\user\Plugin\Action\ChangeUserRoleBase" not found in /home/www/drupal8/test/core/modules/user/src/Plugin/Action/AddRoleUser.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/user/src/Plugin/Action/AddRoleUser.php on line 14