Fatal error: Uncaught Error: Class "Drupal\link\Plugin\migrate\field\d6\LinkField" not found in /home/www/drupal8/test/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php:23 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php on line 23