[SOAP] WCF SOAP WSDL... Parsing Schema: element error

Hello Everyone,
I am trying to access a WCF WSDL service to send message, but getting
following error:

SOAP-ERROR: Parsing Schema: element
'http://schemas.microsoft.com/2003/10/Serialization/Arrays:ArrayOfstring'
already defined

I am using native SOAP extension of php, and also tried with nuSOAP, but
getting same error...
My script looks as; using deliverMTMessage method with parameters...

<?php
try {
   $client = new
SoapClient("http://84.230.69.67/MTRECEIVER/TSLMTRECEIVER.svc?wsdl");
   $response=$client->deliverMTMessage(array(
   									'applicationId' => '5789',
									'username'=>'nickname', 
									'password' => 'WknqPI==', 
									'price' => '',
									'moMessageId' => '',
									'mTMessageId' => '',
									'telcoId' => '8',
									'receiverMsisdn' => '97650000000',
									'senderMsisdn' => '97650000000', 
									'messageType' => 'SMS',
									'mtType' => '2',
									'messageText' => 'test message from shahid',
									'serviceType' => '1',
									'additionalInformation' => '',
									'shortCode' => '836282',
									'billServiceID' => '', 
									'priority' => '1'));
   print_r($response);
   echo htmlentities($response);
  
    } catch (SoapFault $e) {
   print_r($e->getMessage());
 }
?>

I shall appreciate any help...
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