Registration wont work?

i followed all the instructions on the web page on opensim but everytime i do a request i get "Failure" returned i did the registration in PHP it is running on a linux server with everything enabled.

i also enabled the things in the robust.ini but it wont work for some reason, can anyone help me to see if i did anything wrong?

this is my PHP code:

<?

function getGUID(){
if (function_exists('com_create_guid')){
return com_create_guid();
}else{
mt_srand((double)microtime()*10000);//optional for php 4.2.0 and up.
$charid = strtolower(md5(uniqid(rand(), true)));
$hyphen = chr(45);// "-"
$uuid =substr($charid, 0, 8).$hyphen
.substr($charid, 8, 4).$hyphen
.substr($charid,12, 4).$hyphen
.substr($charid,16, 4).$hyphen
.substr($charid,20,12);
return $uuid;
}
}

$new_UUID = getGUID();

$fields = array(
'METHOD' => "createuser",
'FirstName' => "testFirst",
'LastName' => "testLast",
'Password' => "123456",
'Email' => "test@test.com";,
'PrincipalID' => $new_UUID);



$ch = curl_init("http://<my-IP>:8003/accounts");

curl_setopt($ch, CURLOPT_POST, TRUE);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

$result = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);

echo "Return code:" . $info['http_code'] . "<br>";
echo "$result";
?>

i have debug on and it does say that there is a request there