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                        /洪大师带你解读Symfony 2框架

symfony 输出css异常

<head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>
            {% block title %}
            {% endblock%}
        </title>
        {% block global_css %}
            {% stylesheets
                    '@ShopWebBundle/Resources/public/css/*'
            %}
            <link rel="stylesheet" href="{{ asset_url }}" />
            {% endstylesheets %}
        {% endblock %}
        {% block my_css %}
        {% endblock %}
        {% block global_js %}
        {% endblock %}
        {% block my_js %}
        {% endblock %}
    </head>
为什么我会报下面异常，求洪老师指教！
An exception has been thrown during the compilation of a template ("You must add ShopUserBundle to the assetic.bundle config to use the {% stylesheets %} tag in ShopUserBundle::loginlayout.html.twig.") in "D:\php_env\htdocs\sfshop\src\Shop\Bundle\UserBundle/Resources/views/loginlayout.html.twig".