SubversionEdge REST API doesn't work

<?php
// set up the URL value involved in a variable
$url = "http://code.example.com:3343/csvn/api/1/user?format=json";
// administrative user for API access
$username = 'grundlett';
$password = 'secret-words';

// set up the data that is going to be passed
$data = array(
  array(
    "username" => "example1",
    "password" => "mysecret",
    "fullName" => "Example Uno",
    "emailAddress" => "info@example.com"
  )
);


$jsonData = json_encode($data);

echo "We're going to send this data\n";
print_r ($jsonData);
//  exit();
// perform the curl transaction
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_USERPWD, $username . ":" . $password);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt ($ch, CURLOPT_POST, true);
curl_setopt ($ch, CURLOPT_POSTFIELDS, $jsonData);
// curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: text/xml"));
curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/json"));

$response = curl_exec($ch);
$decode = json_decode($response);
print_r($decode);

?>
///////////////////////////////////////////////////////
///////////////// run it //////////////////////////////
php -f example.php
///////////////// results / output ////////////////////
We're going to send this data
[{"username":"example1","password":"mysecret","fullName":"Example Uno","emailAddress":"info@example.com"}]

stdClass Object
(
    [errorMessage] => Bad request (check parameters)
    [errorDetail] => The email address entered is in an invalid format
)