Uncaught Error: Call to undefined function simpelxml_load_file()

ol.JPG

<?php

$username = $_POST['username'];

$password = $_POST['password'];

$url = "http://localhost/webservice/sistema/service.php?username=".$username."&password=".$password;

$bacaxml = simpelxml_load_file($url);

foreach($bacaxml->response as $respon)

{

if ($respon == "TRUE") echo "Selamat, Login Sukses";

else if ($respon == "FALSE") echo "Login Gagal";

}

?>