ftpfolder script problem

I've use the below Applescript successfully on other Mac's to ftp files to my ftp server. I've ported it over to my G5, and I now receive this error..

"Can't get alias "Macintosh HD:Users:mynameesktop:ftpfolder:foofile"."

I've confirmed the path to the file appears correct. Can anyone point me to what could be causing this - or what it means?

Code:

on adding folder items to thisFolder after receiving theseItems
	repeat with aFile in theseItems -- assumed to be files, not folders
		try
			set tName to name of (info for (contents of aFile))
			-- tName is the name of the one of the files in theseItems
			-- do your FTP thing with the name like this:
			set myFile to "~/Desktop/ftpfolder/" & tName
			-- etc. i.e. all the rest of your script
			set myName to "userid"
			set myPass to "pswd"
			set myCurl to "curl -u " & myName & ":" & myPass & " ftp://vidego.multicastmedia.com/ -T " & myFile
			do shell script myCurl
			delete (contents of aFile)
			-- I prefer to move them to my own "discard" folder so I can check before they go.
		on error theError
			display dialog theError -- in case something goes wrong; don't delete, tell me
		end try
	end repeat
end adding folder items to