SAXException trying to deserialize this fault

[Trevor Porter]

I'm trying to figure out why Axis throws a SAXException trying to 
deserialize the following SOAP message containing a fault:

<SOAP-ENV:Envelope 
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"; 
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"; 
xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance"; 
xmlns:xsd="http://www.w3.org/1999/XMLSchema";>
 <SOAP-ENV:Body>
 <ns1:SomeFunction xmlns:ns1="urn:foo">
 <Param1 xsi:type="xsd:string">some value</Param1>
 <Param2 xsi:type="xsd:string">some value</Param2>
   <SOAP-ENV:Fault>
   <faultcode xsi:type="xsd:string">Client</faultcode>
   <faultstring xsi:type="xsd:string">Client request/data 
invalid</faultstring>
     <detail>
     <message xsi:type="xsd:string">some message</message>
     <errorcode xsi:type="xsd:string">-5</errorcode>
     </detail>
   </SOAP-ENV:Fault>
 </ns1:SomeFunction>
 </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

The code I'm using:
Service service = new Service();
Call call = (Call) service.createCall();
call.setTargetEndpointAddress(endpoint);
call.setSOAPActionURI("SomeAction"); 
call.setOperationName(new QName("urn:foo", "SomeFunction"));
call.addParameter("Param1", org.apache.axis.Constants.XSD_STRING, 
javax.xml.rpc.ParameterMode.IN);
call.addParameter("Param2", org.apache.axis.Constants.XSD_STRING, 
javax.xml.rpc.ParameterMode.IN);
call.setReturnType(XMLType.XSD_STRING);
String result = (String)call.invoke( new Object[] { "value1", "value2" } );

The exception stack trace that results:
org.xml.sax.SAXException: SimpleDeserializer encountered a child 
element, which is NOT expected, in something it was trying to deserialize.
       at 
org.apache.axis.encoding.ser.SimpleDeserializer.onStartChild(SimpleDeserializer.java:149)
       at 
org.apache.axis.encoding.DeserializationContext.startElement(DeserializationContext.java:1025)
       at 
org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.java:159)
       at 
org.apache.axis.message.MessageElement.publishToHandler(MessageElement.java:1138)
       at 
org.apache.axis.message.RPCElement.deserialize(RPCElement.java:308)
       at org.apache.axis.message.RPCElement.getParams(RPCElement.java:342)
       at org.apache.axis.client.Call.invoke(Call.java:2420)
       at org.apache.axis.client.Call.invoke(Call.java:2319)
       at org.apache.axis.client.Call.invoke(Call.java:1776)
remote exception=org.xml.sax.SAXException: SimpleDeserializer 
encountered a child element, which is NOT expected, in something it was 
trying to deserialize.