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Are you referring to this app: Import Data app? To properly import a .csv or .xls file submission, you will need to copy the formatting of the template as mentioned by the error.
Here's an example:
You'll need to copy those template format, example: 1_Full Name_fullname should be the name of the column where the name values are. In .csv or .xls file that would be the 1st row. Please refer to this guide: http://www.jotform.com/help/309-How-to-Migrate-Form-Data-from-Adobe-FormsCentral-to-JotForm, where the template format is mentioned.
I hope this helps. Do let us know if this works.