Can anyone help me understand why the following simple code is throwiing an 
error.  I get this error:

Detail          The fault returned when invoking the web service operation 
is:<br> <pre>'' java.lang.NullPointerException</pre>
Message         Cannot perform web service invocation authenticate. 

when this routine routine:
<cfset ws = CreateObject("webservice", 
"http://localhost/opensource/QBWC_Shell.cfc";) />
<cfset ret = ws.clientVersion(strVersion="2.0.0.135") />

<cfset soapresp = GetSOAPResponse(ws)>
<h2>SOAP Response for clientVersion</h2>
<cfdump var="#soapresp#">

<cfset ret = ws.authenticate(strUserName="User", strPassword="PW") />

<cfset soapresp = GetSOAPResponse(ws)>
<h2>SOAP Response for authenticate</h2>
<cfdump var="#soapresp#">

Calls this WebService:
<CFCOMPONENT style="RPC" namespace="http://developer.intuit.com/";>

         <cffunction access="remote" name="clientVersion" returntype="String">
                <cfargument name="strVersion" type="string" required="yes">
  
                <cfreturn "O:2.0.0.135">
         </cffunction>
     
        <cffunction access="remote" name="authenticate" returntype="array">
                <cfargument name="strUserName" type="string" required="yes" >
                <cfargument name="strPassword" type="string" required="yes" >

                <cfset var aryReturn = arrayNew(1) />
                
                <cfset arrayAppend(aryReturn, "") >
                <cfset arrayAppend(aryReturn, "nvu")  >
                <cfreturn aryReturn>
         </cffunction>
</CFCOMPONENT>


Any help much appreciated. 

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