The error was not being captured in the log file so I added a step at the end for reboot, now in the logs i get the error message.
I found the issue that I was setting up Time Zone for "Canberra, Melbourne, Sydney" in my image though my server was set for "US & Canada".
I changed the time zone on my server to "Canberra, Melbourne, Sydney", rebooted the server and tried creating the boot media again but it failed again with the same error. Is there anything else I need to do to resolve this issue.
Thanks,
Jeet