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