Fatal error: Uncaught Error: Interface "Drupal\Core\StreamWrapper\StreamWrapperInterface" not found in /home/www/drupal8/test/core/lib/Drupal/Core/StreamWrapper/ReadOnlyStream.php:15
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/lib/Drupal/Core/StreamWrapper/ReadOnlyStream.php on line 15