I don't know - I seem to remember something triggering this for unsupported languages - but fair enough if it's in English - I haven't got the code in front of me.
It's going to be something 'silly' like a missed end sub, reserved keyword or the version was set to a high number at some point and you've set it back to a lower one.. Maybe conflicting libraries or something like that as well.
I haven't got your code or an apk to try in front of me so I can't really help much more than that.
If it were me I'd take a copy of the code and then look to remove or comment large chunks to see if chopping stuff out removes the packaging issue. It's either going to be something inanely stupid or something deep in a library or similar...