AxisFault : Couldn't find deserializer for type

[Nicky Eng]

I have a java client that invoking a web service.

here is my code:

Service service = factory.createService(wsdlURL, SERVICE_NAME);
Call call = service.createCall(PORT_NAME, operationName);
call.setTargetEndpointAddress("http://xxx.xxx.xxx.xxx:xxxx/services/SDPServices");
Object[] inParams = new Object[] {login_name, serv_id, "44444" , "3333333", "sender", "ref_id", 0 , "resURL" ,st , st2 };
String ob = (String) call.invoke(inParams);    // obviously this line throws the error

I dont understand this error:
Anyone knows ?

Aug 24, 2009 2:37:20 PM org.apache.axis.client.Call invoke
SEVERE: Exception:
org.xml.sax.SAXException: Deserializing parameter 'return':  could not find dese
rializer for type {http://xsd.gateway.sdp.xxxxx.com}SDPResult
        at org.apache.axis.message.RPCHandler.onStartChild(RPCHandler.java:277)
        at org.apache.axis.encoding.DeserializationContext.startElement(Deserial
izationContext.java:1035)
        at org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.ja
va:165)
        at org.apache.axis.message.MessageElement.publishToHandler(MessageElemen
t.java:1141)
        at org.apache.axis.message.RPCElement.deserialize(RPCElement.java:236)
        at org.apache.axis.message.RPCElement.getParams(RPCElement.java:384)
        at org.apache.axis.client.Call.invoke(Call.java:2467)
        at org.apache.axis.client.Call.invoke(Call.java:2366)
        at org.apache.axis.client.Call.invoke(Call.java:1812)
        at test.digi.TestCall.main(TestCall.java:66)
AxisFault
 faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server.userException
 faultSubcode:
 faultString: org.xml.sax.SAXException: Deserializing parameter 'return':  could
 not find deserializer for type {http://xsd.gateway.sdp.xxxxx.com}SDPResult
 faultActor:
 faultNode:
 faultDetail:
        {http://xml.apache.org/axis/}stackTrace:org.xml.sax.SAXException: Deseri
alizing parameter 'return':  could not find deserializer for type {http://xsd.ga
teway.sdp.xxxxx.com}SDPResult
        at org.apache.axis.message.RPCHandler.onStartChild(RPCHandler.java:277)
        at org.apache.axis.encoding.DeserializationContext.startElement(Deserial
izationContext.java:1035)
        at org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.ja
va:165)
        at org.apache.axis.message.MessageElement.publishToHandler(MessageElemen
t.java:1141)
        at org.apache.axis.message.RPCElement.deserialize(RPCElement.java:236)
        at org.apache.axis.message.RPCElement.getParams(RPCElement.java:384)
        at org.apache.axis.client.Call.invoke(Call.java:2467)
        at org.apache.axis.client.Call.invoke(Call.java:2366)
        at org.apache.axis.client.Call.invoke(Call.java:1812)
        at test.digi.TestCall.main(TestCall.java:66)

        {http://xml.apache.org/axis/}hostname:websvr2

org.xml.sax.SAXException: Deserializing parameter 'return':  could not find dese
rializer for type {http://xsd.gateway.sdp.xxxxx.com}SDPResult
        at org.apache.axis.AxisFault.makeFault(AxisFault.java:101)
        at org.apache.axis.client.Call.invoke(Call.java:2470)
        at org.apache.axis.client.Call.invoke(Call.java:2366)
        at org.apache.axis.client.Call.invoke(Call.java:1812)
        at test.digi.TestCall.main(TestCall.java:66)
Caused by: org.xml.sax.SAXException: Deserializing parameter 'return':  could no
t find deserializer for type {http://xsd.gateway.sdp.xxxxx.com}SDPResult
        at org.apache.axis.message.RPCHandler.onStartChild(RPCHandler.java:277)
        at org.apache.axis.encoding.DeserializationContext.startElement(Deserial
izationContext.java:1035)
        at org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.ja
va:165)
        at org.apache.axis.message.MessageElement.publishToHandler(MessageElemen
t.java:1141)
        at org.apache.axis.message.RPCElement.deserialize(RPCElement.java:236)
        at org.apache.axis.message.RPCElement.getParams(RPCElement.java:384)
        at org.apache.axis.client.Call.invoke(Call.java:2467)
        ... 3 more