Fatal error: Uncaught Error: Class "Drupal\views\Plugin\views\wizard\WizardPluginBase" not found in /home/www/drupal8/test/core/modules/user/src/Plugin/views/wizard/Users.php:20 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/user/src/Plugin/views/wizard/Users.php on line 20