Fatal error: Uncaught Error: Class "Drupal\field\Plugin\migrate\source\d7\FieldInstance" not found in /home/www/drupal8/test/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerViewMode.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerViewMode.php on line 13