In Site Mnager in General section (in Filezilla) set protocol to SFTP. If you haven’t changed the ssh port, leave the port blank or default. Or if you have changed the ssh port, set it as port.
Hopefully helps.
Its not needed to do that. From the error message, I think that you enabled SSL fro the FTP.
Put this line into the tls config from proftpd or directly in the main config: