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