[flexcoders] Flex client and Python web service: any standard WSDL format?

[suyash]

Hi
  I have written a web service in Python and trying to design a client
in Flex 2.But some error or the other crops up.
   I am able to make a call to the web service but the SOAP response
from the python web service is not getting read properly....and so i
am not able to read the response data from the SOAP request.

The common error I keep getting is "null object cannot have properties".
I tried receiving the response in all types of data providers.
ArrayColection ,XMLCollection but no success. Is the SOAP response not
being read because of a non compatible WSDL format? (unlikely because
the call is successful...but the return is not)

here is my Flex client:
 
    <mx:WebService id="wsXenmonService" 
        wsdl="http://localhost/xenmon02.wsdl";
        useProxy="false" fault="Alert.show(event.fault.faultString,
'Error');">
        <mx:operation name="getMetrics">
            <mx:request>
             </mx:request>
        </mx:operation>
    </mx:WebService>
           
     <mx:Button x="30" y="250" 
            label="Get Xenmon Metrics"
click="wsXenmonService.getMetrics.send()"/>

 <mx:ArrayCollection id="acX"
source="{ArrayUtil.toArray(wsXenmonService.getMetrics.lastresult)}"      
<ms:DataGrid dataprovider="acX" width="50%" /> 
</mx:Application>

Is there any standard WSDL format I should stick to? 

is there is any way to solve this problem...Would love to hear your
suggestions...Thanks....Good day