FTP Voyager problem

Hİ ,

I want to synchronize with ftp voyager scheduler I receive the following error when I am constantly missing or wonder what I'm doing wrong ?

[04] Sun 02Jan14 10:32:32 - Unable to resolve "ftp://ftp.nai.com/" [11004].

[04] Sun 02Jan14 10:32:32 - Connection attempt failed. Retrying in 3 seconds ...

[03] Sun 02Jan14 10:32:36 - Retrying Connection (attempt 9) ...

[03] Sun 02Jan14 10:32:36 - Resolving host "ftp://ftp.nai.com/" ...

[04] Sun 02Jan14 10:32:36 - Unable to resolve "ftp://ftp.nai.com/" [11004].

[12] Sun 02Jan14 10:32:36 - (Task: Daily Backup of 1 Folder) - Execution failed (Last Error Message:).

[12] Sun 02Jan14 10:32:36 - (Task: Daily Backup of 1 Folder) - Next scheduled execution on Friday, January 03, 2014 10:32:00