UPDATE: This error came back. After some research I finally figured out what the issue was, at least in my case. I reported a negative gross income on Line 1a of Sch C. This was the combination of my gross receipts and charge backs for unpaid customer invoices. I removed this negative figure and replaced it with the positive gross receipts figures and entered the chargeback amount on line 2 Returns and Allowances.
The net result is the same and this error was removed.
