missing XML:

````xml
<?xml version="1.0" charset="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services">

    <config xmlns="http://cmf.symfony.com/schema/dic/simple_cms"
        enabled="false"
        basepath="/cms/simple"
        manager-registery="doctrine_phpcr"
        manager="null"
        document-class="Symfony\Cmf\Bundle\SimpleCmsBundle\Doctrine\Phpcr\Page"
        use-sonata-admin="auto"
    >
        <sonata-admin sort="false" />
    </config>

</container>
````