A guest’s full name (both first and last) is required in order to upload your guest list. Check your list to make sure there are no blank cells in these columns.
Also, check to make sure that there is no space between the top row and the rows containing guest information.
*Note* If you have any “hidden” cells within your Excel spreadsheet, the guest list will not upload. Make sure to delete any existing “hidden” columns before uploading your .XLSX.