issues in web.config, what does this error mean?

I'm trying to build a small fb application using asp.net mvc 2, and facebook C# .net From some reason, the code from the sample application doesn't seem to work for me. Here's the exception I am receiving from my web.config file.

Unrecognized attribute 'apiKey'. Note that attribute names are case-sensitive.

Source Error:

 <facebookSettings   
 apiKey="XXXX"  
 apiSecret="XXXX"   
 appId="XXXX" />

I've set this as part of the followin开发者_StackOverflow社区g configuration:

<configSections>
    <section name="facebookSettings" type="Facebook.FacebookConfigurationSection"/>
  </configSections>
  <facebookSettings
    apiKey="XXXX"
    apiSecret="XXXX"
    appId="XXXX"
     />

Any ideas?

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apiKey does not exist in FacebookConfigurationSection from changeset 'b6900dde15d7' which is made by ntotten on 12/07/2010 08:11 AM.

Download / install last Facebook C# SDK and take a look at last samples.

Here is FacebookConfigurationSection source code. You will see that apiKey is not there any more.

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Where in the web.config do you have this configuration? According to the error it doesn't recognize the attribute apiKey which means can't read it. What else is there to say? I think the error message is pretty clear.