nftp and lftp

For downloading directories/subdirectories of files from remote server, I tried:
1) ncftp remove_server
    get -R directory
   
     But I get error message: Could not traverse directory: could not parse extended file or directory information. Perhaps it is because that -R option only works if the remote server is unix.

 2) Then I tried lftp for complex file transfer and it works well.
    lftp   -e  'mirror /pub/data/npt   . '     ftp://example.ftp.site
    -e: the downloading command