Fatal error: Uncaught Error: Class "Drupal\Core\Cache\Context\UserCacheContextBase" not found in /home/www/drupal8/test/core/lib/Drupal/Core/Cache/Context/IsSuperUserCacheContext.php:12
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/lib/Drupal/Core/Cache/Context/IsSuperUserCacheContext.php on line 12