Fatal error: Uncaught Error: Class "Drupal\node\Plugin\views\argument_default\Node" not found in /home/www/drupal8/test/core/modules/book/src/Plugin/views/argument_default/TopLevelBook.php:18 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/book/src/Plugin/views/argument_default/TopLevelBook.php on line 18