This also happened to me recently when I saved and tried to reload on another device. Once it happened on one device (my phone), I got the same message when trying to load game to my Kindle and my tablet. (Note, my errored game wasn't already on them, although SFP was.)
Restarting SFP, restarting my phone, clearing cashe, force stop ... nothing helped. Finally I tried deleting SFP from my phone and downloading it from the play store. I did get my game back (phew!) but did lose some progress. It did not go to lasted save, but several saves back. Maybe a day or so. I do save often.
I'm not recommending it would also work for you. I don't know enough about things. Contacting support would be safer. But if you are desperate and have no other choices, it would be an option to try.