Fatal error: Uncaught Error: Class "Drupal\Core\Routing\RouteSubscriberBase" not found in /home/www/drupal8/test/core/modules/content_moderation/src/Routing/ContentModerationRouteSubscriber.php:22 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/content_moderation/src/Routing/ContentModerationRouteSubscriber.php on line 22