I've just pulled an all-nighter trying to get this to work, and I'm probably missing something foolish, but help me out.

I have a symfony2 service which sends emails. I have injected the @templating service into my service's constructor like so:

services.yml

order_service:
    class: AppBundle\Services\OrderService
    arguments: [ "@doctrine.orm.entity_manager", "@mailer", "@templating" ]

OrderService.php

/**
 * @var EntityManager
 */
protected $em;

protected $twig;

protected $mailer;    

public function __construct(EntityManager $_entityManager, $_mailer, $_twig)
{
    $this->em = $_entityManager;
    $this->mailer = $_mailer;
    $this->twig = $_twig;
}

I have my templates located in AppBundle/Resources/views/Emails. Further down in my service is the function that tries to send emails.

protected function send_emails($vendors, $order)
{
    $customer = $order->getCustInfo();

    // Send email(s) to customer
    foreach ($order->getVouchers() as $voucher)
    {
        $message = \Swift_Message::newInstance()
            ->setSubject('Voucher # ' . $voucher->getId())
            ->setFrom('[email protected]')
            ->setTo($customer->email)
            ->setBody($this->twig->render(
                'Emails/email-voucher.html.twig', [
                    'order'     =>  $order,
                    'voucher'   =>  $voucher,
                    'customer'  =>  $customer
                ]
            ), 'text/html');

        $this->mailer->send($message);
    }
}

I always get the error Unable to find template \"Emails/email-voucher.html.twig\".

So, here's a summary of what I've tried:

• Basically everything suggested on similar StackOverflow questions
• Moving templates to app/Resources/views
• Every path/relative path I can think of in the call to ->render()
• Pulling my hair out

Any ideas?