Fatal error: Uncaught Error: Class "Drupal\Core\StreamWrapper\LocalStream" not found in /home/www/drupal8/test/core/lib/Drupal/Core/StreamWrapper/TemporaryStream.php:13 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/lib/Drupal/Core/StreamWrapper/TemporaryStream.php on line 13