I can't upgrade. – BeepWatch 2 Beeping Stopwatch Review

Error (6777001): Setup failed. That's the error that I get when I open the app, and then it says that I couldn't upgrade to the pro version and then the error code. Happens every time. I tried clicking on upgrade to pro and it also says can't upgrade, please try again later. Can you please fix?
Review by lawrenceperez7676 on BeepWatch 2 Beeping Stopwatch.