[SOAP] making progress.. need help figuring out an exception

at this point, I've authenticated with the login service, and I believe I'm
now passing the cookie correctly to the ADBAccess service, but when I do a
soapcall to getCMSData, I'm getting an exception.

Here's the relevant code:

		$agDataService->__setCookie('cookie', $s_Cookie);
		
		$a_includeList[0]="*";		

		$a_getCMSTables_args['opName']='accounts';
		$a_getCMSTables_args['startDate']='01/07/2011';
		$a_getCMSTables_args['endDate']='01/08/2011';
		$a_getCMSTables_args['lastID']='';
		$a_getCMSTables_args['includeList']= a_includeList;

		$agTables = $agDataService->__soapCall('getCMSData', $a_getCMSTables_args,
null, new SoapHeader('http://webservice.agemni.com', 'cookie', $s_Cookie));

and here's the exception:
System.Web.Services.Protocols.SoapException: Server was unable to process
request. ---> System.NullReferenceException: Object reference not set to an
instance of an object. at ADBAccess.setErrorXML(XmlDocument& responseDoc,
XmlElement& DocRoot, String ErrorMessage, Int32 ErrorNum, Int32 numRecords)
at ADBAccess.getCMSData(String opName, String startDate, String endDate,
String lastID, String[] includeList) --- End of inner exception stack trace
---

any ideas?
		
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