Fatal error: Uncaught Error: Class "Drupal\views\Plugin\views\field\FieldPluginBase" not found in /home/www/drupal8/test/core/modules/contextual/src/Plugin/views/field/ContextualLinks.php:21
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/contextual/src/Plugin/views/field/ContextualLinks.php on line 21