error 103: application.initialWindow.autoOrients is an unexpected element/attribute

Hello.

I'm using Flash Builder 4.5 to experiment with building a mobile app for my Android Nexus One.  In order to keep the app in landscape mode, regardless of the orientation of the device, I've read that I need to set the following in the "AppName-app.xml" file:

<aspectRatio>landscape</aspectRatio>

<autoOrients>false</autoOrients>

And this does work fine in the debugger, however when I attempt to test it on my connected device it throws this error:

Error occurred while packaging the application:

D:\Projects\FlexMobile\AppName\bin-debug\AppName-app.xml(108): error 103: application.initialWindow.autoOrients is an unexpected element/attribute

I know that I'm able to build and test apps on my device, as I've been through the Flex Test Drive for Mobile tutorial (http://www.adobe.com/devnet/flex/testdrivemobile.html) and was able to build and run that app with no issues and this app I'm currently working on does run on the device if I do not attempt to restrict the auto orientation.

Thank you.

(Note:  I'm re-posting this from the Flex SDK > Developers forum.)