如果使用php nusoap在WSDL中未定义操作，如何修复

Question

I am currently working on a project that uses web service PHP Nusoap. I implement it at first in the local computer and it is already working perfectly fine, it can insert already in the database.Since, we are also deploying our project in the production server (Linux RHEL 4) so we also need to include the web service. In implementing this in the production server, we got this error :

Operation '' is not defined in the WSDL for this service

Here is the full details :

<?xml version="1.0" encoding="utf-8"?><SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
 xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
 xmlns:xsd="http://www.w3.org/2001/XMLSchema"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
    <faultcode xsi:type="xsd:string">SOAP-ENV:Client</faultcode>
    <faultactor xsi:type="xsd:string"></faultactor>
    <faultstring xsi:type="xsd:string">Operation &apos;&apos; is not defined in the WSDL for this service
    </faultstring>
    <detail xsi:type="xsd:string"></detail>
</SOAP-ENV:Fault>

HERE IS THE CODE :

client.php

<?php
    require_once('lib/nusoap.php');

    $data = json_decode(file_get_contents("php://input"), true);

    $file_name = $data['file_name'];
    $location = $data['location'];

    $client = new nusoap_client('http://servername:port/WebService/server.php?wsdl', true);

    if ($SERVER['REQUEST_METHOD'] == 'POST') {
        $err = $client->getError();

        if ($err) {
            echo "<h2> Constructor error </h2><pre>" . $err. "</pre>" ;
            echo "<h2> Debug </h2><pre>" . htmlspecialchars($client->getdebug(),        ENT_QUOTES) . "</pre>" ;
            exit();
        }

        $datas = array (
            'file_name' => $file_name,
            'location'   => $location
        );

        $result = $client->call('InsertData', $datas);

        if ($client->fault) {
            echo "<h2> Fault (Expect - The request contains an invalid SOAP Body)</h2> <pre>" ;
            print_r ($result);
            echo "</pre>";
        } else {
            $err = $client->getError ();
            if ($err) {
                echo "<h2> Error </h2><pre>" . $err.  "</pre>";
            } else {
                print_r ($result);
            }
        }
    } else if ($_SERVER['REQUEST_METHOD'] != 'POST') {
        echo "Method is not POST " ;
    }

?>

server.php

<?php 
require_once('lib.nusoap');

$server = new soap_server();
$server->configureWSDL('Database Sample Insertion', 'urn:Insert');
$server->soap_defenconding = 'UTF-8' ;

$server->register('InsertData', 
    array (
        'file_name'  => 'xsd:file_name',
        'location'    => 'xsd:location'
    ),
    array ('return' => 'xsd:string'),
    'urn:Insert',
    'urn:Insertwsdl#InsertDate',
    'rpc',
    'literal'
);

function InsertData ($file_name, $location) {
    $db_host = 'localhost';
    $db_username = 'username';
    $db_password = '' ;
    $db_name = 'sample' ;

    $conn = new mysqli ($db_host, $db_username, $db_password, $db_name);

    if ($conn->connect_error) {
        trigger_error('Database connection failed : ' .$conn->connect_error , E_USER_ERROR);
    }

    $sql = "INSERT INTO transaction (`filename`, `location`) VALUES ('$file_name', '$location')";

    $query = $conn->query($sql);

}

    $HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '' ;
    $server->service($HTTP_RAW_POST_DATA);


?>

what does this problem means and how can we solve this? Or how to setup the web service PHP Nusoap in the production server? Any ideas/suggestions is appreciated. Thanks