URL Access Scripting + parameter error

Hi,
I am using
tell application “URL Access Scripting”
upload file “abc.jpg” to “ftp://username:password@domainname” without binhexing
end tell
When i run this script in script editor on MAC -OS 10.1 and 10.2 it works fine But it is not working on 10.3
It gives an error
“URL Access Scripting got an error: Parameter error”

Regards
Tarjinder