Gumbo Skin mxml with Flex Builder 3 namespace error

Posted on August 5, 2008 | 2 comments

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 “″ and “” namespaces I get the following error.

Only one language namespace must be specified per document. Found ‘′ and ‘’.

To get around this you need to declare the specific package as the namespace. Like this:


NOTE: There is more in depth information on this namespace issues in MXML 2009 spec under “Namespaces and Component Disambiguation”.

  • Gregory Jastrab

    I just finished getting through the MXML 2009 Spec, and haven’t tested it yet, but I believe you could also do xmlns:mx=”library:adobe/flex/halo”.

  • Renaun Erickson

    You are correct, too much to keep track of.