[flexcoders] Error 1069 Decoding Error

[Mandy]

I am getting a decoding error calling a JAX-WS webservice. Both the 
flex app calling the webservice and the webservice are on the same 
machine, so I don't think I need a crossdomain.xml file. The funny 
thing is the webservice is returning the xml response to me that I 
want, but it gets sent to the fault method. I am using the Flex 2 
SDK. 

Here is the error:
[RPC Fault faultString="Error #1069" faultCode="DecodingError" 
faultDetail="null"]
  (mx.messaging.messages::AcknowledgeMessage)#0
    body = "<?xml version="1.0" encoding="utf-8"?><soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";>
    <soapenv:Body>
    <My xml response here>
    </soapenv:Body></soapenv:Envelope>"
Here is my code:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; 
layout="absolute">
        <mx:Script>
                <![CDATA[
                        import mx.controls.Alert;
                        import mx.rpc.events.ResultEvent;
                        import mx.rpc.events.FaultEvent;
                        
                        public function get(event:ResultEvent):void
                        {
                                Alert.show(event.toString());
                        }
                        
                        public function web(event:FaultEvent):void
                        {
                                Alert.show("EVENT " + event.toString
() + "\nFAULT " + event.fault.toString() 
                                + "\nMESSAGE " + 
event.message.toString() + "\nTYPE " + event.type.toString()
                                + "\nEVENT_PHASE " + 
event.eventPhase.toString());
                        }
                        
                        public function callWS():void
                        {
                                ProductsWS.getProducts(username, 
password);
                        }       
                ]]>
        </mx:Script>
        <mx:WebService id="ProductsWS" 
wsdl="http://host:port/Workspace/Project/WEB-INF/wsdl/Sample.wsdl";
                useProxy="false" fault="web(event)" 
showBusyCursor="true" requestTimeout="30">
                <mx:operation name="getProducts" result="get(event)" 
fault="web(event)"/>
        </mx:WebService>
        <mx:Button id="CallWS" label="call WS" click="callWS();" 
enabled="true" x="292" y="234"/>
</mx:Application>

Thanks,
Amanda