What is the old save file from? 0.06? Try another save file, see if any of them work.
Unfortunately, according to the creator of the Renpy game engine, it means the old save is trying to be loaded onto a new version that isn't compatible. Really sorry about that, it must've happened when I updated the game engine mid-dev and the Renpy porting messed up. I assume and think it works fine on PC and MAC though, it's just the android porting