They do have all the same column names....I'm simply changed it from a bunch of *Summary*.csv files to *Detailed*.csv files (the destination has already been changed to reflect the new column names). 

All of the Summary and Detail files are identical with the same columns, same number of columns, same data types.  It worked yesterday with my summary files and now won't work with the detail files.  Even with a SINGLE csv file (so there is no chance of any differences between the files) it does not run anymore.