{% if app.session is not null and app.session.started %} {% set flash_messages = app.session.flashbag.all %} {% if flash_messages|length > 0 %} <div id="flash-messages"> {% for label, messages in flash_messages %} {% for message in messages %} <div class="alert alert-{{ label }} text-center"> {{ message|trans|raw }} </div> {% endfor %} {% endfor %} </div> {% endif %}{% endif %}