Fatal error: Uncaught Error: Class "Drupal\views\Plugin\views\field\LinkBase" not found in /home/www/drupal8/test/core/modules/contact/src/Plugin/views/field/ContactLink.php:17 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/contact/src/Plugin/views/field/ContactLink.php on line 17