Salesforce error: Element {}item invalid at this location

i am using the below code to connect to salesforce using php

 require_once ('SforcePartnerClient.php');
require_once ('SforceHeaderOptions.php');  
require_once ('SforceMetadataClient.php'); 

$mySforceConnection = new SforcePartnerClient(); 
$mySforceConnection->createConnection("cniRegistration.wsdl");
$loginResult = $mySforceConnection->login("username", "password.token");

$queryOptions = new QueryOptions(200);

try {

  $sObject = new stdclass();
  $sObject->Name = 'Smith';
  $sObject->Phone = '510-555-5555';
  $sObject->fieldsToNull = NULL;


  echo "**** Creating the following:\r\n";
  $createResponse = $mySforceConnection->create($sObject, 'Account');

  $ids = array();
  foreach ($createResponse as $createResult) {
    print_r($createResult);
    array_push($ids, $createResult->id);
  }

} catch (Exception $e) {

  echo $e->faultstring;
}

But the above code is connect to salesforce database. But is not executing the create commands. it's giving me the below error message

Creating the following: Element {}item invalid at this location

can any one suggest me to overcome the above problem