Fatal error: Uncaught Error: Class "Drupal\Core\Render\BubbleableMetadata" not found in /home/www/drupal8/test/core/lib/Drupal/Core/GeneratedLink.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/lib/Drupal/Core/GeneratedLink.php on line 14