Fatal error: Uncaught Error: Interface "Drupal\file\FileUsage\FileUsageInterface" not found in /home/www/drupal8/test/core/modules/file/src/FileUsage/FileUsageBase.php:11 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/file/src/FileUsage/FileUsageBase.php on line 11