WBadmin script to backup System State into another partition failed

I tried numerous time but it is still failed like the following script on cmd prompt.

Is there any way to create automated script to backup system state on my Windows Server 2008 using WBAdmin into D drive inside a directory ?

any help would be greatly appreciated.

C:\Users\Administrator>wbadmin START
SYSTEMSTATEBACKUP
-backuptarget:D:\Admin\Backup wbadmin 1.0 – Backup command-line tool (C) Copyright 2004 Microsoft Corp.

Starting System State Backup
[12/02/2011 4:22 AM] Retrieving volume
information…

This would backup the system state
from volume(s) SYS(C:) to
D:\Admin\Backup. Do you want to start
the backup operation? [Y] Yes [N] No Y

ERROR – Specified backup location
could not be found.

C:\Users\Administrator>wbadmin START
SYSTEMSTATEBACKUP
-backuptarget:D:\Admin wbadmin 1.0 – Backup command-line tool (C) Copyright
2004 Microsoft Corp.

Starting System State Backup
[12/02/2011 4:22 AM] Retrieving volume
information…

This would backup the system state
from volume(s) SYS(C:) to D:\Admin. Do
you want to start the backup
operation? [Y] Yes [N] No Y

ERROR – Specified backup location
could not be found.

C:\Users\Administrator>wbadmin START
SYSTEMSTATEBACKUP
-backuptarget:"D:\Admin\Backup" -quiet wbadmin 1.0 – Backup command-line tool
(C) Copyright 2004 Microsoft Corp.

Starting System State Backup
[12/02/2011 4:23 AM] Retrieving volume
information…

This would backup the system state
from volume(s) SYS(C:) to
D:\Admin\Backup.

ERROR – Specified backup location
could not be found.

C:\Users\Administrator>wbadmin START
SYSTEMSTATEBACKUP -backuptarget:D:\
-quiet wbadmin 1.0 – Backup command-line tool (C) Copyright 2004
Microsoft Corp.

Starting System State Backup
[12/02/2011 4:23 AM] Retrieving volume
information…

This would backup the system state
from volume(s) SYS(C:) to D:.

ERROR – Specified backup location
could not be found.

C:\Users\Administrator>