Assemblies needed for Chrome to display ASP menu

I've added the section below trying to have my meny displayed correctly in the Chrome browser.
However, VS2008 complains:

Message      1      Could not find schema information for the element 'case'.      
Message      2      Could not find schema information for the attribute 'match'.      

These assemblies listed are present but clearly one or more is missing. Which please?

/gustav

<browserCaps>
      <case match="Chrome/(?'version'(?'major'\d+)(?'minor'\.\d+)\.\d+.\d+)\sSafari/\d+\.\d+">
        browser=Chrome 
        version=${version} 
        majorversion=${major} 
        minorversion=${minor} 
      </case>
</browserCaps>
 
---
				<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
				<add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
				<add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

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