{% for flashMessage in app.session.flashbag.get('error') %}
    <div class="flash-notice">
        {{ flashMessage }}
    </div>
{% endfor %}

{% for type, flashMessages in app.session.flashbag.all() %}
    {% for flashMessage in flashMessages %}
        <div class="alert alert-{{ type }}">
            {{ flashMessage|trans }}
        </div>
    {% endfor %}
{% endfor %}