To TurboTax: I may have a good clue as to the TT401 and TT403 errors. It concerns the "Itemize Field" command. I am using the new Turbotax Canada 2019. I kept getting the aforementioned errors. I repeatedly deleted the offending file and re-transferred in the 2018 original file. Upon entering a value into line 8860 (Professional Fees), I could save and recover the file. When I chose to "Itemize Field", I could not save the file because of the TT error. When I REMOVED the itemization and reentered the numeric same value, I could then save and recover the file. I therefore believe the error is with the "Itemize Field" feature, as it was virtually the only item/number that I entered into the "virgin" file. In past years I have used the "Itemize Field" feature extensively -- including in line 8860. As these TT errors seem to be common -- judging from the complains on line -- this is worth exploring at your end.
