错误：您无法创建非活动范围（“请求”）的服务（“templatating.helper.assets”）

我遇到以下错误，

  [Twig_Error_Runtime]                                                                                                                                                                                     
  An exception has been thrown during the rendering of a template ("You cannot create a    service ("templating.helper.assets") of an inactive scope ("request").") in "AcmeMessagingBundle:Comment:email.html.twig".

我正在从 symfony 2 自定义控制台命令渲染树枝模板

下面是我的服务类，它是事件订阅者，我通过 symfony 控制台命令触发 onCommentAddEmail 事件来发送电子邮件，

class NotificationSubscriber implements EventSubscriberInterface
{
     private $container;

    public function __construct(ContainerInterface $container)
    {
        $this->container = $container;
    }


    public static function getSubscribedEvents()
    {
         return array(
            'comment.add'     => array('onCommentAddEmail', 0),
         );
     }

     public function onCommentAddEmail(CommentAddEvent $event)
     {
              ...................


             $body = $this->container->get('templating')->render(
            'AcmeMessagingBundle:Comment:email.html.twig',
                array('template' => $template)
             );

     .......


    }

}

$body 被传递给 swiftmailer 来发送电子邮件。

这是我的服务定义，

Acme\MessagingBundle\订阅者\NotificationSubscriber

<services>
    <service id="notification_subscriber" class="%notification_subscriber.class%">
        <argument type="service" id="service_container" />
        <tag name="kernel.event_subscriber" />
    </service>
</services>

下面的帖子说问题在 symfony 2.1 中已修复，但我仍然收到错误，

 https://github.com/symfony/symfony/issues/4514

我已经提到过http://symfony.com/doc/current/cookbook/service_container/scopes.html，我已将整个容器传递给我的服务。

不确定这是否是最好的方法，但添加这个对我有用，

    $this->container->enterScope('request');
    $this->container->set('request', new Request(), 'request');