Server was unable to process request. --> Object reference not set to an instance of an object. error

[Dica]

Hi all

I've got a java microEdition client trying to make soap requests to my .Net
service. i keep getting "Server was unable to process request..." err msg
when attempting to make the request. The method runs fine from a web
browser, so i suspect the problem is with the java app. i added a simple
"Hello World" method to the service for testing purposes and the java client
calls and receives the service fine. the problem appears to be with methods
that require passing parameters, which appear to be coming through as null.
these are the soap header's I'm sending:

<v:Envelope xmlns:i="http://www.w3.org/2001/XMLSchema-instance"
xmlns:d="http://www.w3.org/2001/XMLSchema"
xmlns:c="http://schemas.xmlsoap .org/soap/encoding/"
xmlns:v="http://schemas.xmlsoap .org/soap/envelope/"><v:Header
/><v:Body><n0:sy ncRecords id="o0" c:root="1"
xmlns:n0="http://services.biscan ada.com/service1.asmx?o p=getMyTimeShee t"><sU
serName i:type="d:strin g">jane</sUserName><sPas sword
i:type="d:strin g">doe</sPassword><sele ctedDate
i:type="d:strin g">9/12/2005</selectedDate></n0:syncRecords> </v:Body></v:Enve
lope>

and this is the response:

<?xml version="1.0" encoding="utf-8"?>

<soap:Envelop e xmlns:soap="htt p://schemas.xmlsoap .org/soap/envelope/"
xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http ://www.w3.org/2001/XMLSchema">

<soap:Body>

<soap:Fault>

<faultcode>soap :Server</faultcode>

<faultstring>Se rver was unable to process request. --&gt; Object
reference not set to an instance of an object.</faultstring>

<detail />

</soap:Fault>

</soap:Body>

</soap:Envelope>

Any ideas?

tks