{{ form_start(contactForm, {'attr': {'novalidate': 'novalidate'}}) }} 
<div class="contact-form">
    <div id="contact" class="pr-0 pl-0 ml-0">
        <div class="col-lg-12 text-center text-light">
            {{ form_errors(contactForm) }}
        </div> 
        <div>
            {{ include('flash.html.twig') }}
            <div class="col-lg-12 text-center">
                <h4 class="mb-0">Envoyer un Message</h4>
            </div>
            {{ form(contactForm) }} 
        </div>
    </div>
</div>
{{ form_end(contactForm) }}