Generating an apk in FB 4.7 trial? apk is not getting generate under the libs folder.

[ComputerS]

I am trying to build a simple camera application in Flash Builder 4.7 version.This Flash Builder is also a trial version.But when I create a Mobile Flex Project , then every time do not generate apk file under libs folder.How to recover from this problem?

I attach a snapshot of my Flash Builder creating mobile flex project.