+ $admin_message = DI::l10n()->t('template engine is not registered!');
+ DI::logger()->critical($admin_message, ['template_engine' => $template_engine]);
+ $message = DI::app()->isSiteAdmin() ?
+ $admin_message :
+ DI::l10n()->t('Friendica can\'t display this page at the moment, please contact the administrator.');
+ throw new ServiceUnavailableException($message);