Gumbo Skin mxml with Flex Builder 3 namespace error

I am using Flex Builder 3 to build Gumbo (Flex 4) application targeted for Flash Player 10. I came across this situation in the Gumbo skin file where I wanted to put a mx.controls.Image control into the skin. When trying to add both “http://ns.adobe.com/mxml/2009″ and “http://www.adobe.com/2006/mxml” namespaces I get the following error. Only one language namespace must be specified per document. Found...

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