Error 1120: Access of undefined property air

[onurcan1977]

I'm new with Air and I've found following code on the net:

code:

---

var file = air.File.applicationStorageDirectory.resolvePath("  test.txt");

var str = "Hello.";

file.addEventListener(air.Event.COMPLETE, fileSaved);

file.save(str);

function fileSaved(event)

{

air.trace("Done.");

}

---

But I get following errors:

1120: Access of undefined property air.    air.trace("Done."); 

1120: Access of undefined property air.    var file = air.File.applicationStorageDirectory.resolvePath("test.txt"); 

1120: Access of undefined property air.    file.addEventListener(air.Event.COMPLETE, fileSaved);

I'm using Flash CS4. I also tried publishing but it didn't work. Can anyone help me?