Trimming the sitemap

I am trying to hide the admin files from normal users, however I get the following error:


Error    11    Unrecognized configuration section siteMap.    C:\projects\FamilyPhotoAlbum_VS_2010\web.config    137 


Below is the web.config:


<?xml version="1.0"?>
<!--
    Note: As an alternative to hand editing this file you can use the
    web admin tool to configure settings for your application. Use
    the Website->Asp.Net Configuration option in Visual Studio.
    A full list of settings and comments can be found in
    machine.config.comments usually located in
    \Windows\Microsoft.Net\Framework\v2.x\Config
-->
<configuration>
    <configSections>
&nb ...