Fatal error: Uncaught Error: Class "Drupal\Core\DependencyInjection\Container" not found in /home/www/drupal8/test/core/tests/Drupal/FunctionalTests/Bootstrap/ErrorContainer.php:10 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/tests/Drupal/FunctionalTests/Bootstrap/ErrorContainer.php on line 10