SOAP 调用有关问题

SOAP 调用问题

PHP code

$soapclient = new soapclient("http://shippingapi.ebay.cn/production/v2/orderservice.asmx?wsdl");

$params = array(
    'Version' => "2.0.0",
    'APIDevUserID' => "sureelectronics",
    'APIPassword' => "7114209N1OCBA61N83CRA0PY1F743DSGTM7GEAY581CND3BHG0POUW20111540",
    'APISellerUserID' => "sureelectronics",
    'MessageID' => "125625622452",    
    'TrackCode' => "LK042013892CN"    
);






$functions = $soapclient->CancelAPACShippingPackage($params);



print_r($functions);

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为什么为出错啊，出错如下：
Fatal error: Uncaught SoapFault exception: [soap:Server] System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at WebServiceCN.OrderService.CancelAPACShippingPackage(CancelAPACShippingPackageRequest CancelAPACShippingPackageRequest)

------解决方案--------------------

PHP code

$soapclient = new soapclient("http://shippingapi.ebay.cn/production/v2/orderservice.asmx?wsdl");$params = array(    'Version' => "2.0.0",    'APIDevUserID' => "sureelectronics",    'APIPassword' => "7114209N1OCBA61N83CRA0PY1F743DSGTM7GEAY581CND3BHG0POUW20111540",    'APISellerUserID' => "sureelectronics",    'MessageID' => "125625622452",        'TrackCode' => "LK042013892CN"    );$functions = $soapclient->CancelAPACShippingPackage(array("CancelAPACShippingPackageRequest"=>$params));print_r( $functions);