<configScope name="PagePreview">

  <description>

    Special configuration scope used to store page previews

  </description>

  <access>

    <securityAccess objectType="group">

      <keyVal>Everyone</keyVal>

      <grant>all</grant>

    </securityAccess>

  </access>

</configScope>

To manage the page previews permissions a new configScope named PagePreview has been added to the initial data. Therefore, either import the configScope.xml file or create such config scope.