I have problems with my code i dont know whyI have problems with my code i dont know whyI have problems with my code i dont know whyI have problems with my code. I tried to make a controller but it dont send it do the main page

Controlller route: 

 #[Route('/', name: 'app_default')]
    public function index(ProductRepository $productRepository): Response
    {
        return $this->render('default/index.html.twig', [
            'products'=>$productRepository->findAll(),
        ]);
    }

Index:: 

<div class="container text-center">
        <div class="row">
            {% for product in products %}
            <div class="col-4">
                <div class="card" style="width: 18rem;">
                    <img src="images/{{ product.image }}" class="card-img-top" alt="...">
                    <div class="card-body">
                        <h5 class="card-title">{{ product.name }}</h5>
                        <p class="card-text"> {{ product.description }}</p>
                        <a href="#" class="btn btn-primary">kopen</a>
                    </div>
                </div>
            </div>
            {% endfor %}
        </div>
    </div>

    <div class="card" style="width: 18rem;">
        <div class="card-body">
            <h5 class="card-title">Behandelingen</h5>
            <p class="card-text">Overzicht behandelingen</p>
            <a href="{{ path('app_product_index') }}" class="btn btn-primary">Ga naar behandelingen</a>
        </div>
    </div>

I tried but it didnt work i dont know why please help me!