PHP 5.3中的soap方法调用中的异常

I am trying to call the following web service http://iskynettrack.skynetwwe.info/TrackingService/TrackingService_v1.asmx but I am getting in response:

Exception in ValidateConsignor(consignorUsername, consignorPassword, consignorAccount, stationCode) Method: Procedure or function 'ValidateConsignorLoginDetails' expects parameter '@UID', which was not supplied. Array ( [0] => SimpleXMLElement Object ( [GetSkyBillTrackResponse] => SimpleXMLElement Object ( [GetSkyBillTrackResult] => SimpleXMLElement Object ( [errorMessage] => Exception in ValidateConsignor(consignorUsername, consignorPassword, consignorAccount, stationCode) Method: Procedure or function 'ValidateConsignorLoginDetails' expects parameter '@UID', which was not supplied. ) ) ) ) Array ( [soap:Body] => Array ( [GetSkyBillTrackResponse] => Array ( [GetSkyBillTrackResult] => Array ( [errorMessage] => Exception in ValidateConsignor(consignorUsername, consignorPassword, consignorAccount, stationCode) Method: Procedure or function 'ValidateConsignorLoginDetails' expects parameter '@UID', which was not supplied. ) ) ) )

I am supplying everything correctly here is my code.

$client = new SoapClient('http://iskynettrack.skynetwwe.info    /TrackingService/TrackingService_v1.asmx?WSDL', array('trace' => 1));

$datatrack=array('consignorUsername,'=>"R1803362", 
'consignorPassword'=> "R1803362",
        'consignorAccount'=> "R1803362",
              'stationCode'=> "DHX",
              'isRef'=>"0",
               'shipmentNumber'=> "088800202392");

$crshipment=$client->GetSkyBillTrack($datatrack);

$strresp=$client->__getLastResponse() . "
";