title: Error injecting repository into service with Symfony3.3
body: <p>I have an application that consists of a service layer and a repository layer. For both the services and the repositories I have declared interface and I inject the interface for services in the controller and services get injected with interfaces of the repositories. This is all done with autowire set to true.</p>
  
  <p>When I call a method on one of the injected services it all works fine, as long as I don't call a function that needs one of the injected repositories. When I try to call a function that uses one of the repositories I get the following error:</p>
  
  <blockquote>
    <p>Cannot autowire service "AppBundle\Repository\TestRepository": argument "$em" of method "Doctrine\ORM\EntityRepository::__construct()" must have a type-hint or be given a value explicitly.</p>
  </blockquote>
  
  <p>Now I figured that this has to do with the fact that this has to to with EntityRepository class from which my repositories extend, cause when I look at the constructor it looks like this:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>class TestRepository extends EntityRepository implements TestRepositoryInterface
  {
  public function __construct(
              EntityManager $em,
              Mapping\ClassMetadata $class
          ) {
              parent::__construct($em, $class);
          }
  
      /**
       * @return string
       */
      public function getTest(): string
      {
          return 'This is a test';
      }
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>Which clearly contains the $em parameter that is mentioned in the error message. I have just no clue how to solve this.
  Currently my services and repositories are configured the same in the services.yml, but since the services seem to work, I would think that is not the problem. Do I need to disable autowire for my repositories and configure them manually in the services.yml, or am I just missing something really obvious? </p>