Delete the file named “known_hosts” in the “.ssh” directory in your home folder (or the row in the “known_hosts” file with the key it is complaining about).
Please remember that folders preceded by a . (full stop) are hidden, so make sure you enable view of hidden files.
Done the terminal one several times but still nothing. Read another post about removing the Cyberduck key, but not sure if they meant from the Cyberduck directory, or in that same SSH folder.
How do I view hidden files to make sure I am really deleting the keys?