php - Symfony Twig variable not recognized (Variable does not exist)

This was working fine hours ago, I get data from database and simply display it in a table in Twig. This is the controller from where I get the instance of the variable having my entity "Cours"

 /**
     * @Route("/listeCours", name="liste_cours")
     */
    public function index()
    {
        $lstCours = $this->getDoctrine()
            ->getRepository('App:Cours')
            ->findAll();

        return $this->render('liste_cours/index.html.twig', ['lstCours' => $lstCours]);
    }
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I saved data from the repository for the entity "Cours" in the variable "lstCours" which is the one I will call later in twig here,

{% for cours in lstCours %}
                        <tr>
                            <td>{{ cours.nom }}</td>
                            <td>{{ cours.type }}</td>
                            <td>{{ cours.description }}</td>
                            <td>{{ cours.prix }}</td>
                            <td>
                                <button class="btn_apt btn"><a href="">Ajouter</a></button>
                            </td>
                        </tr>
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Compiler keep showing an exception saying the variable (lstCours) does not exist.

Thank you in advance.

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