Digital Table Clock for old phones (2.3.6)

Hi, I have a very old phone with android 2.3.6
And i want to build an app which will display a clock on full screen
so people can keep it on a phone stand on table as a table clock.

I am facing a problem the apks are running on 6.0.1 but not on 2.3.6 it says 'There was a problem parsing the package'

Do you have any extensions in your project? Apps compiled with base App Inventor should work on Android versions as far back as Android 2.1. If your app doesn't use extensions and you want to attach it to this post we can try and replicate the issue on our end.

No I don't have any extensions and the android version is 2.3.6
The phone is Samsung Duos GT-S6802 no root