Can you make a screenshot of that error message? Sounds like your device might be very outdated.
Yeah, looks like you have an old Android version. See if you can get the files with your regular file manager but I doubt it, the data folder might not even show up in there. You probably have to start from the beginning then :(
The new game version also puts your saves into the regular file system, so this shouldn't be a problem in the future at least.