Fatal error: Uncaught Error: Class "Drupal\views\Plugin\views\relationship\RelationshipPluginBase" not found in /home/www/drupal8/test/core/modules/taxonomy/src/Plugin/views/relationship/NodeTermData.php:19 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/taxonomy/src/Plugin/views/relationship/NodeTermData.php on line 19