If you double click the Flat File Connection Manager to open the Flat File Connection Manager Editor and choose the Preview, what do you see in that column? You may have to create a test file for this with the error row closer to the top of the file.

I have tried unsuccessfully to re-create the error in 2012, my thought is that the package upgrade process has somehow gone slightly wrong.:w00t:

Probably the best way of fixing this is to delete and re-create the Flat File Connection Manager and the Flat File Source.

😎