Gumbo in Flex builder 3: cannot resolve FxApplication to component implimentation

Question

Hello everyone,
I've been banging my head on the keyboard over this issue for a while. I've downloaded and successfully installed 2 seperate versions of the nightly Flex Gumbo SDK 4.0.0.6831 and 4.0.0.6898 (two versions because i had first assumed that the error was a nightly bug). I've set the Flex compiler to use the new 4.0.0.6898 build and changed the Require flash player version to 10.0.0.  Everything set right?
so i put this:
<Application xmlns="http://ns.adobe.com/mxml/2009" layout="absolute">
<FxButton label="Hello World" />
</Application>
and get the error at compile time: Gumbo in Flex builder 3: cannot resolve <FxApplication> to component implimentation. I've tried everything: <Application>, changed the namespaces, and more. Any other ideas?
Thank you in advance -brandon

Answer 1

Try something like this:
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/halo">
    <s:Button label="Hello World" />
</s:Application>