I cna't see the problem... on simple 25 line of code

[sinatosk]

what am trying to do is to get it to send some vars to a HTTPSerivce using the
"POST" method and I wanted to try the basics out before I started working big
with flex.... but everytime I press that button... I keep getting this error

TypeError: Error #1010: undefined has no properties.
at var_test/var_test::do_send_vars()
at var_test/__btn_send_vars_click()

I'm using "Flex Builder 2.0 Beta 1" and "Flex Enterprise Services 2.0"



<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2005/mxml" xmlns="*"
layout="absolute" creationComplete="initApp()">
<mx:HTTPService id="doAction" url="http://godo.ath.cx:80/flyffpl/index.php"
useProxy="false" showBusyCursor="true" method="post"/>

<mx:Script>
<![CDATA[
public var vars:Object;

private function initApp():void
{
vars = new Object();
}

private function do_send_vars():void
{
vars.username.text = 'username_test';
vars.password.text = 'password_test';

doAction.send(vars);
}
]]>
</mx:Script>

<mx:Button id="btn_send_vars" label="Send vars" click="do_send_vars();"/>
</mx:Application>