registering multiple sitemap files

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I am trying to use multiple sitemaps within my site as described in the
following MSDN article:
http://msdn2.microsoft.com/en-us/library/ms178426.aspx

I tried adding the following to the web.config file:

<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<appSettings>
<add key="ConnectionString" value="Password=xxxxx;Persist Security
Info=True;User ID=username;Initial Catalog=DBName;Data Source=SERVERNAME" />
</appSettings>
<system.web>
<siteMap defaultProvider="XmlSiteMapProvider">
<providers>
<add name="TopNavigationBar" type="System.Web.XmlSiteMapProvider"
siteMapFile="~/NavigationMenus/TopNavigationBar.sitemap" />
<add name="LeftNavigationBar"type="System.Web.XmlSiteMapProvider"
siteMapFile="~/NavigationMenus/LeftNavigationBar.sitemap" />
</providers>
</siteMap>
<compilation debug="true"/>
<authentication mode="Windows"/>
</system.web>
</configuration>

But, I recieved the following error: the provider 'XmlSiteMapProvider'
specified for the defaultProvider does not exist in the providers
collection.

Where did I go wrong?

 

[-D-]

Please disregard....I figured it out.