Corrupted file generated

[qeude]

Hello, I'm trying to use KnpSnappyBundle in my Symfony4 project. I'm actually able to translate my twig in pdf by using the command line with wkhtmltopdf but when I use KnpSnappy, the generated file is corrupted ... Here is my call in my controller :

     $html = $this->renderView('metier/fiche/fiche.html.twig', [
        'metier' => $this->getFirstApiResult($metierCall),
        'softskills' => $this->getSecondApiResult($skillsCall)->skills,
    ]);

    return new PdfResponse(
        $this->get('knp_snappy.pdf')->getOutputFromHtml($html),
        'file.pdf'
    );

Ask if you need more details. Thanks. :)

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