Fatal error: Uncaught Error: Class "Drupal\Core\TempStore\PrivateTempStoreFactory" not found in /home/www/drupal8/test/core/modules/user/src/PrivateTempStoreFactory.php:18 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/user/src/PrivateTempStoreFactory.php on line 18