I have an SSIS Package That takes data from an Excel file and transforms certain columns using several Convert Data tasks and a Derived Data task at the end before loading data into the SQL table I have an error handling step which redirects any faied rows into a text file. The problem I'm having is this error message when I go to map the text output. "There is more than one data source column with the name "__". The data source column names must be unique." When I go into the column property of the Flat File Connection Manager Editor I see two columns for each actual columns but am not allowed to delete any of them. Any help would be appreciated.