XML error parsing SOAP payload

Hi

I wanted to create a soap server for my project and I am planning to user the services module along with soap_server.
But when testing these Im getting an error message which says

"XML error parsing SOAP payload on line 1: Space required"

These are the modules I have installed

Drupal 6.17
Services - 6.x-2.4
soap_server - 6.x-1.2-beta1 with the patch from http://drupal.org/files/issues/751326.patch

Followed the steps mentioned in the link http://drupal.org/node/1101362

After this enabled the 'system service' module and tried accessing the method 'system.getServices' using a PHP code.

Im getting the above mentioned XML error message and the output.

The PHP code is

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

$domain = 'test.localhost';

$kid = '2df30b8f761ab301b12dc4973d2edf9d';

$nonce = user_password();
$method_name = 'system.getServices';
$timestamp = (string) strtotime("now");


// now prepare a hash
$hash_parameters = array(
  $timestamp,
  $domain,
  $nonce,
  $method_name,
);

// create a hash using our API key
$hash = hash_hmac("sha256", implode(';', $hash_parameters), $kid);

$useCURL = '1';
$client = new nusoap_client("http://soap_server.localhost/services/soap?wsdl", true);
$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();
}
$client->setUseCurl($useCURL);
$client->soap_defencoding = 'UTF-8';


$params = array(
  'hash'                     => $hash,
  'domain_name'         => $domain,
  'domain_time_stamp' => $timestamp,
  'nonce'                   => $nonce
);

$result = $client->call($method_name, $params, '', '');
if ($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>' . $err . '</pre>';
    } else {
        echo '<h2>Result</h2><pre>'; print_r($result); echo '</pre>';
    }
}
echo '<h2>Request</h2><pre>' . htmlspecialchars($client->request, ENT_QUOTES) . '</pre>';
echo '<h2>Response</h2><pre>' . htmlspecialchars($client->response, ENT_QUOTES) . '</pre>';
echo '<h2>Debug</h2><pre>' . htmlspecialchars($client->getDebug(), ENT_QUOTES) . '</pre>';

On further analysis it seems that the XML parsing is getting failed in the nusoap.php file and hence the above error is coming

when checking the XML which is getting parsed, it having tags as with spaces

<access callback xsi:type="xsd:string">user_access</access callback>

<access arguments xsi:type="SOAP-ENC:Array" SOAP-ENC:arrayType="xsd:string[1]"><item xsi:type="xsd:string">get available services</item></access arguments>

from these it can be seen that the tags are having 'space' value eg: access callback; which might be causing the issue

Is this a normal scenario? How can I remove these tags? Also uploaded the complete XML file which is getting parsed in the nusoap.php file