Assuming you and/or your spouse if filing jointly, had a US home for more than 1/2 the year in 2021. Go back through the interview and be sure you have answered that question in the interview. That determines if just part I-B is filled or Parts I-C and II-A are completed.
If you had a US home then only Part I-B should be completed. Otherwise the other two parts and not Part 1-B should be completed.
If the error pops again there should be a form view that shows on your screen. Look over that form view and eliminate the entries in any parts that don't apply.
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