From what I understood from the user they were able to get around this issue. The issue had to do with values not being correct in the actual document they were importing (.csv, excel, journal file whatever). My advice would be to have the user go through the data they are trying to upload and double check it for any errors.
Ours was fixed by removing some stray digits that made their way into other fields or correcting the totals (One of the totals was off by 0.01$)
I hope this helps