Dear Katrin Thanks for your quick reply. When I open my cvs file, it's opened as a spreadsheet in a Excel-like software. I guess if you open it with notepad, you would see comas. I didn't, I trusted my software when it saved the file as a csv file. (I can't double-check now, my file is on another computer in another location) Should I really check that a cvs file is coma-separated? O_o And as mentioned in my original email, I have already downloaded the starter file and copy-paste all the headers. It is all in one row, the very first one, all in lowercase, all at the right place, etc etc. Well it is just copy-paste -- what could have gone wrong with a simple copy-paste? Plus, I have double-checked the header row, two thousands times, there is not the slightest unusual thing. If the Patrons import says it's a problem with the header row, is it really the header row? can it be that there is a problem somewhere else? Thanks a lot for your help! Sonia.