[Resolvido] Problemas com Silverlight e FaultExceptions.

Pessoal,

Estou tentando fazer com que o Silverlight 4 entenda o FaultExceptions, segui o respectivo link:

http://msdn.microsoft.com/en-us/library/dd470096%28VS.96%29.aspx .

Mas estou tendo problemas com a tag: <silverlightFaults/>, quando retiro a mesma consigo acessar o serviço perfeitamente, ao usar a mesma o seguinte erro é apresentado:

...

Parser Error Message: An error occurred creating the configuration section handler for system.serviceModel/behaviors: Extension element 'silverlightFaults' cannot be added to this element. Verify that the extension is registered in the extension collection at system.serviceModel/extensions/behaviorExtensions.

Parameter name: element

...

Segue abaixo o Web.config para uma melhor visualização:

<?xml version="1.0"?>

<configuration>
 <system.web>
 <compilation debug="true" targetFramework="4.0" />
 <customErrors mode="Off"/>
 </system.web>

 <system.serviceModel>

 <extensions>
 <behaviorExtensions>
 <add name="silverlightFaults"
 type="Servico.SilverlightFaultBehavior,
 Servico,
 Version=1.0.0.0,
 Culture=neutral,
 PublicKeyToken=null"/>
 </behaviorExtensions>
 </extensions>

 <services>
 <service name="Servico.Teste">
 <endpoint address=""
 binding="basicHttpBinding"
 contract="Servico.Teste"
 bindingConfiguration="Servico.Teste.customBinding0"/>
 <endpoint address="mex"
 binding="mexHttpBinding"
 contract="IMetadataExchange" />
 </service>
 </services>

 <bindings>
 <basicHttpBinding>
 <binding name="Servico.Teste.customBinding0">
 </binding>
 </basicHttpBinding>
 </bindings>

 <behaviors>
 <serviceBehaviors>

 <behavior name="">
 <serviceMetadata httpGetEnabled="true" />
 <serviceDebug includeExceptionDetailInFaults="true" />
 </behavior>

 </serviceBehaviors>

 <endpointBehaviors>
 <behavior name="">
 <silverlightFaults/> // TAG QUE GERA O PROBLEMA APRESENTADO ACIMA.
 </behavior>
 </endpointBehaviors>

 </behaviors>

 <serviceHostingEnvironment aspNetCompatibilityEnabled="true"
 multipleSiteBindingsEnabled="true" />

 </system.serviceModel>

</configuration>

Como resolver tal situação, De forma ao Silverlight conseguir ententer o FaultException ?

Desde Já, Agradeço.