Fatal error: Uncaught Error: Class "Drupal\Core\Ajax\RedirectCommand" not found in /home/www/drupal8/test/modules/webform/src/Ajax/WebformRefreshCommand.php:12
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/modules/webform/src/Ajax/WebformRefreshCommand.php on line 12