I think I found the solution!

I was having the same issue, and rejected filing twice. What the error states is that "make sure you have tax paid, date...entered correctly on part 2 of the 1116 comp. worksheet. I had two columns on part 1, showing income. One for dividends, and one for Capital Gains. Pro-series wants two lines/rows to be entered in taxes paid because part-1 shows 2 columns of income/countries. I was entering all taxes paid in one column, and that was the reason it was getting rejected. I hope this helps few of you who has multiple columns of income in part 1.