Fatal error: Uncaught Error: Class "Drupal\Core\Plugin\Discovery\AnnotatedClassDiscovery" not found in /home/www/drupal8/test/core/modules/migrate/src/Plugin/Discovery/AnnotatedClassDiscoveryAutomatedProviders.php:21 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/migrate/src/Plugin/Discovery/AnnotatedClassDiscoveryAutomatedProviders.php on line 21