There are lots of people encountering this error in all variations of the Turbo Tax software. AFAIK, if there are indeed no errors the issue is resolved by restarting the software. And if there are errors then one might find them by re-running the federal and state reviews after restarting the software. However, it seems that they might still be missed until one tries to electronically file the return, at which point Turbo Tax will point out any errors before submitting the return electronically.
It is clearly a defect in the software but most people haven't a clue about it because the behavior is inconsistent. Hopefully, it is fixed in the latest versions.
See: https://www.youtube.com/watch?v=BTeFQfie-eg
