Hey! Without knowing the exact error I'm not sure exactly what the problem is, but Twine saves your progress using your browser's cache, so things that block that (like some ad blockers or cookie blockers) will prevent it from saving properly. If you have any extensions, try disbling them temporarily to see if that's the issue. You can also save to disk, which will save the data as a file on your computer instead. If using the itch.io app, try enabling autoname.