Fatal error: Uncaught Error: Class "Drupal\views\Plugin\views\wizard\WizardPluginBase" not found in /home/www/drupal8/test/core/modules/file/src/Plugin/views/wizard/File.php:16 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/file/src/Plugin/views/wizard/File.php on line 16