This happens if someone tries to do something as another user (the password stored in the savefile doesn't match with the account ID). Did you edit the savefile of sok-stories by any chance? And is this the first time using it or did it work before?
I downloaded it at my main rig at home and then thought I would like to have it on the go thats why I downloaded it from the itch app again (now I also used the browser) and made a game with it. Then I found out there is only -1. I didnt edited anything I just completly deleted every file from sok pop stories and reinstalled it and I still get that message