native.showPopup() issues

I am trying to use this within my app, but I am getting the following error
 

WARNING: CoronaProvider.native.popup.mail is not configured in build.settings

Reading through the documentation here: https://docs.coronalabs.com/api/library/native/showPopup.html it does not mention anything about needed to add something to your build.settings file.

please help

It only works on iOS and Android, not on simulator

It only works on iOS and Android, not on simulator