[rdiff-backup-users] Permission denied (publickey, keyboard-interactive)

[izma aziz]

Hi...

This is the first time i'm using rdiff-backup. I'm trying to run it
using kcron. This is the command that i put inside kcron.

    rdiff-backup /tmp/test address@hidden::/tmp/backup

and this is the error that i got in /var/mail/root.

Permission denied (publickey,keyboard-interactive).
Fatal Error: Truncated header string (problem probably originated remotely)

Couldn't start up the remote connection by executing

    ssh -C address@hidden rdiff-backup --server

Remember that, under the default settings, rdiff-backup must be
installed in the PATH on the remote system.  See the man page for more
information on this.  This message may also be displayed if the remote
version of rdiff-backup is quite different from the local version (0.12.7).

I really need some help. Thanks!
-Izma-