Fatal error: Uncaught Error: Interface "Drupal\Component\PhpStorage\PhpStorageInterface" not found in /home/www/drupal8/test/core/lib/Drupal/Component/PhpStorage/FileReadOnlyStorage.php:8 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/lib/Drupal/Component/PhpStorage/FileReadOnlyStorage.php on line 8