Problem consuming WebService in Flex 3

Hi i am new to flex and trying to consume a web service in flex builder, i use eclipse and have flex plugin over eclipse and all the flex applications work fine and now i tried to access a webservice which is temperature convertor having wsdl location : "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL"

I tried to write the code in flex mixed with script and when i run the project i get the following error

I write down my code which is very simple.. please have a look and help me in this issue, i tried to find over web but i don't get the solution.

I found some solution about the crossdomain.xml which is supposed to be put in the server root or web directory... BUT i am not using this application on ANY SERVER, i just use flex builder over eclipse.
so please let me know if you have valid solution in my case...

Thanks

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
 
 <mx:WebService id="myWebService" wsdl="http://www.w3schools.com/webservices/tempconvert.asmx?WSDL" fault="faultHandler(event)">
     <mx:operation name="FahrenheitToCelsius" result="resultHandler(event)" fault="faultHandler(event)">
      </mx:operation>
    </mx:WebService>

<mx:Script>
        <![CDATA[
    	
    	import mx.rpc.events.FaultEvent;
    	import mx.rpc.events.ResultEvent;
    	import mx.controls.Alert;

private function resultHandler(event:ResultEvent):void {
    		cValue.text = event.result.toString();
    	
    		
    	}

private function faultHandler(event:FaultEvent):void {
    		Alert.show(event.fault.message, "Error");
    	}
        ]]>
    </mx:Script>

<mx:Panel title="Fahrenheit to Celsis Converter" paddingTop="30" paddingRight="10" paddingBottom="30" paddingLeft="10">
        <mx:HBox>
    	<mx:Label text="Fahrenheit Value: "/>
    	<mx:TextInput id="fValue" />
    	<mx:Button id="submit" label="Convert" click="myWebService.FahrenheitToCelsius.send(fValue.text)"/>
        </mx:HBox>

<mx:HBox>
    	<mx:Label text="Celsius Value: "/>
    	<mx:Label id="cValue"/>
        </mx:HBox>

</mx:Panel>

</mx:Application>