The file's header row is missing or invalid. The header row is for Amazon use only and must not be modified or deleted. To correct this error, download the template again from seller Help and use that new copy, or insert the correct header row directly above the column headings in your existing file.
(Fatal) Your input file has invalid or missing header data. The header row is used by Amazon only and must not be modified or deleted. Do one of the following and then resubmit your feed: