Empty link text

Hi When I was checking the overall score of my site using nibbler silktide, it gave a report as "5 links have no text describing their destination.". eg. Empty link text Link URL ---------------- Page URL goaholidays.ektamedicaltravel.com/ -- goaholidays.ektamedicaltravel.com/ (this error for all remaining pages.) I have left no blank alt attr, no dead links and no broken links. Then why is this error? @Saking can you please help?