Could not resolve x to a component implementation problem

Question

Hi,
I have run an example. The code is listed below:
[CODE]
package com.mydomain.components
import mx.controls.Label;
public class CircleLabel extends Label {
public var circleColor:uint = 0x000000;
public function CircleLabel(){
super();
override protected function
updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
super.updateDisplayList(unscaledWidth, unscaledHeight);
// Draw a circle around the label text
graphics.lineStyle(1, this.circleColor, 1.0);
graphics.drawEllipse(-5,-5,this.width+10,this.height+10);
[/CODE]
[CODE]
<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="
http://www.adobe.com/2006/mxml"
xmlns:comps="com.mydomain.components.*"
backgroundColor="#FFFFFF" >
<mx:Panel title="CircleLabel Component" width="500"
height="90"
paddingTop="10" paddingLeft="10" paddingRight="10"
paddingBottom="10"
layout="horizontal">
<comps:CircleLabel text="Black Circle Label"
circleColor="0x000000" />
<mx:Spacer width="20" />
<comps:CircleLabel text="Red Circle Label"
circleColor="0xFF0000" />
</mx:Panel>
</mx:Application>
[/CODE]
I am using Flex Builder 2.0.1. These file are put in the same
Flex project and in the same folder. When I compilled them, there
was an error: Could not resolve <comps:CircleLabel> to a
component implementation.
Please help me to solve this problem.
Thank in advance,
Duc

Answer 1

to be more clear CircleLabel component should be under
com/mydomain/components cirectory