Thanks for this feedback. The error you are getting means that the file is not formatted correctly, or is improperly named. It could be helpful to open the file in a text editor (not Excel) and make sure that it meets the format requirements. Also note that the file name extension is important, and must indicate a text/csv file with a .csv, .txt., or .text at the end. Files ending in .xls or other variants, and files without extensions will fail with this same error.