I got the same error; you can read about it
here.
I found that I had a manager in my league whose name was Harry "Hair" Austin. (Don't ask) The quotes in his name screwed up the utility when it was readying the CSV file that contains manager names, because the CSVs are exported with quotes as the field delimiters.
My suggestion would be to open up your CSVs (small ones first) with a .txt editor and see if you can see anything like that.