How do I correct the amount in "Adj 199A dividends"?

That entry is usually associated with a K-1 schedule entry from a partnerhsip or S corporation. If so, I suggest you go back to review the orginal entry and remove it to see if that resolves your issue. Section 199A refers to a qualified business income deduction (QBI) that may or may not benefit you.

Thank you. I deleted the entry and re-uploaded the pdf of my fund's statement and got the same error. Deleted again and tried retrieving from the fund directly...also unchecked a couple Xs in the review field next to boxes that were empty on the form. I'd previously put zeroes in them, so maybe that was the problem. 

Anyway, finally cleared the error message, so thanks for giving me the push to delete and retry!