title: No route found for "GET /Index" when generating Symfony controller
body: <p>I am using <code>generate:controller</code> to create a new controller in my Symfony 3 application. But the route is not getting found. </p>
  
  <p>Here is the input/output of the command ... </p>
  
  <pre><code>First, you need to give the controller name you want to generate.
  You must use the shortcut notation like AcmeBlogBundle:Post
  
  Controller name: ApplicationSonataPageBundle:Page
  
  Determine the format to use for the routing.
  
  Routing format (php, xml, yml, annotation) [annotation]: yml
  
  Determine the format to use for templating.
  
  Template format (twig, php) [twig]:
  
  Instead of starting with a blank controller, you can add some actions now. An action
  is a PHP function or method that executes, for example, when a given route is matched.
  Actions should be suffixed by Action.
  
  
  New action name (press &lt;return&gt; to stop adding actions): IndexAction
  Action route [/Index]:
  Template name (optional) [ApplicationSonataPageBundle:Page:index.html.twig]:
  
  New action name (press &lt;return&gt; to stop adding actions):
  
  
    Summary before generation
  
  
  You are going to generate a "ApplicationSonataPageBundle:Page" controller
  using the "yml" format for the routing and the "twig" format
  for templating
  Do you confirm generation [yes]?
  </code></pre>
  
  <p>... and here is the content of the new controller class:</p>
  
  <pre><code>namespace Application\Sonata\PageBundle\Controller;
  
  use Symfony\Bundle\FrameworkBundle\Controller\Controller;
  
  class PageController extends Controller
  {
      public function IndexAction()
      {
          return $this-&gt;render('ApplicationSonataPageBundle:Page:index.html.twig', array(
              // ...
          ));
      }
  
  }
  </code></pre>
  
  <p>... which is not called. I instead receive the following error in the browser:</p>
  
  <blockquote>
    <p>No route found for "GET /Index"</p>
  </blockquote>
  
  <p><strong>Is there an additional step I need to do before seeing my action?</strong> </p>
  
  <p>What I have tried: I have so far tried every other type of routing (xml, php, yml) without success. </p>