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