{% if app.session.flashbag.peekAll()|length > 0 %}    
    {% for message in app.flashes('success') %}
        <div class="alert alert-success">
            {{ message }}
        </div>
    {% endfor %}

    {% for message in app.flashes('error') %}
        <div class="alert alert-danger">
            {{ message }}
        </div>
    {% endfor %}   
{% endif %}