[flexcoders] Image upload error

[Joe]

Hello all,

I am using java servlet url as my image uploading url. I can upload 
successfully under Flex 2. As

private function selectHandler(event:Event):void
  {
   var file:FileReference = FileReference(event.target);
   uploadURL.url = "/myUpload?filename=" + file.name + 
"&myfolder=C:\\xampp\\htdocs\\template\\";
 }

However, after I change to Flex 3, I meet this error

Error #2044: Unhandled IOErrorEvent:. text=Error #2038: File I/O Error.
 at 
component::editLaptop/btnNewClicked()[C:\testlc\webapps\ROOT\mc2salekit\component\editLaptop.mxml:247]
 at 
component::editLaptop/__btnNew_click()[C:\testlc\webapps\ROOT\mc2salekit\component\editLaptop.mxml:480]

What should I notice when I convert as 3 code from flex 2 to flex 3 to avoid 
this?

Thank you in advance.

Regards,

Joe