please Help! - building for Android devices

Hello.

Well. I'm having this issue...

I'm trying to build my game to get an .apk and installing on android devices, And I made it but:

1. In the emulator, system returns: "...(My app name) Is requesting graphics API's that are not available on your system and has been terminated"

2. In a Samsung Galaxy S3 Mini, system returns: "This is not a .apk file".

3. In a Samsung Galaxy S Duos. The app works "fine" But there's a function on the gameplay that doesn't execute.

I'm not having console errors or warnings. I tried to compile an .exe and it works fine (executes everything like a charm). But this is so different and I don't know what to do now.

Thank you so much in advance

Regards,