There are lots of people encountering this error in all variations of the Turbo Tax software. AFAIK, the issue is resolved by restarting the software, which is why it worked for you without making any changes. It is clearly a defect in the software but most people haven't a clue about it. Hopefully, it is fixed in the latest versions.
See: https://www.youtube.com/watch?v=BTeFQfie-eg
