I am currently unable to create, preview, or update any Squiffy game. I tried making a new Quest game assuming it was only an issue with Squiffy but that didn't work either. Someone else posted about this and the error seems to still be there.
This is a problem that's still occurring to all creators. We're all on a creation hiatus until either Squiffy figures this stuff out or we migrate to the desktop version (ew). Hopefully, they're on it. But I do miss making games here...
All I can say is that I have told Luis, and he has looked at it. It is not somethinng seen before, so will take some trouble-shooting. Hopefully he will find time to do that over the holiday.