Fatal error: Uncaught Error: Interface "Drupal\Component\Plugin\PluginInspectionInterface" not found in /home/www/drupal8/test/core/modules/migrate/src/Plugin/MigrateSourceInterface.php:18 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/migrate/src/Plugin/MigrateSourceInterface.php on line 18