Fatal error: Uncaught Error: Interface "Drupal\hal\LinkManager\ConfigurableLinkManagerInterface" not found in /home/www/drupal8/test/core/modules/hal/src/LinkManager/RelationLinkManagerInterface.php:5 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/hal/src/LinkManager/RelationLinkManagerInterface.php on line 5