Fatal error: Uncaught Error: Interface "Drupal\content_translation\ContentTranslationManagerInterface" not found in /home/www/drupal8/test/core/modules/content_translation/src/ContentTranslationManager.php:12 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/content_translation/src/ContentTranslationManager.php on line 12