Captivate 9 publish for device...

Hi

I'm new to Captivate and trying to publish a very simple game as an app for testing purposes however I'm encountering the following issues:

• Captivate > publish for devices (all appeared to work)
• 'Publish completed successfully' message
• Download button appears
• 'No application packages have been built at this time' message appears in the browser (after clicking the download button)

Any advice as to what I'm doing wrong?

Many thanks

Kim