What's the right way to use '$this->templating->render'?

Hi, I want to be able to render some service on email builder, I’m trying to use

$content = $this->templating->render(‘HelloWorldBundle:SubscribedEvents\EmailToken:token.html.php’);

but I can’t find any documentation about symfony and “templating” or Idk what I’m not seeing

thanks in advance

symfony version 2.8, mautic version 2.6

mautic 2.16* my bad, at last reply