Symfony cannot find the template file - php

Question

I have follow all the steps related to Symfony installation, and I try the examples of the Symfony book (provided by the Symfony web site). Currently I am on Controllers chapter (5) and I try the following code:
namespace MyBundle\FrontBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
class HelloController extends Controller
{
public function indexAction($name, Request $request)
{
return $this->redirect($this->generateUrl('front_buy'), 301);
}
public function buyAction(Request $request)
{
return $this->render(
'Hello/buy.html.twig',
array(
'name' => 'Nikos'
)
);
}
}
but I get the following error:
INFO - Matched route "front_buy" (parameters: "_controller": "MyBundle\FrontBundle\Controller\HelloController::buyAction", "_route": "front_buy")
CRITICAL - Uncaught PHP Exception InvalidArgumentException: "Unable to find template "Hello/buy.html.twig"." at /var/www/projects/symfony/vendor/symfony/symfony/src/Symfony/Bridge/Twig/TwigEngine.php line 128
Context: {"exception":"Object(InvalidArgumentException)"}
I know is not something fancy, but I don't know how to fix the problem.
My view file is under the following path : ./src/MyBundle/FrontBundle/Resources/views/Hello/buy.html.twig.

Answer 1

You need to render it with the following syntax:
$this->render('AcmeBlogBundle:Blog:index.html.twig')
or with this syntax
$this->render('#BlogBundle/Blog/index.html.twig')
An Example:
$this->render('#FrontBundle/Hello/buy.html.twig)
More information can be found on the documentation, also refering to symfonys best practices templates should be stored in app/Ressources/views

Answer 2

in "app/config/config.yml" be sure to have this:
framework:
# ...
templating:
engines: ['twig']

Answer 3

In my case, the problem was really related to the specific version of Symfony.
My project used to be run with Symfony 2.8.19. I tried to migrate it to another Linux
evironment (uning symfony2.8.42) and then I got the very same error with the same code (very wierd).
I tried the solutions mentioned before and none worked like using :
$this->render('#BlogBundle/Blog/index.html.twig')
or
$this->render('AcmeBlogBundle:Blog:index.html.twig').
After several tries, I found the problem. In fact, in my old env, I had :
return $this->render('XxxxxBundle:Default:zzzz.html.twig';
But the problem was with Capitalized Default because the real path was with an uncapitalized default
so changing it to the following fixed the problem in my new env:
return $this->render('XxxxxBundle:default:zzzz.html.twig';