Trace

I am extremely new to as3 and just have started coding in as3. I have the following code in a001.as file


package {

	import flash.display.Sprite;

	public class FirstCode extends Sprite {

		public function FirstCode() {

			trace("yes");

		}

	}

}

It seems extremely simple and I feel very positive that there is no error in this code.

And this line in a001.fla


import as3.a001;

The .as file is in as3 folder so I think the import should work fine.

The one (and only) problem (that could arise) is that the trace leaves nothing in the output window.

I tried various other codes instead of this but to no avail. None work. Its just a blank screen.
This problem is actually taking me to the verge of hating as3. I am stuck on this for days and none of the solutions I saw seem to work for me. Any help would be appretiated.

By the way I have Flash CS4.