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Im trying to make a Facebook login for my website and always get errors. I got the files from GitHub and used the example.php and the files from the src.
 * Copyright 2011 Facebook, Inc.
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
require 'facebook.php';
// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
  'appId'  => 'the id',
  'secret' => 'secret',
  'cookie' => true
// Get User ID
$user = $facebook->getUser();
// We may or may not have this data based on whether the user is logged in.
// If we have a $user id here, it means we know the user is logged into
// Facebook, but we don't know if the access token is valid. An access
// token is invalid if the user logged out of Facebook.
if ($user) {
  try {
    // Proceed knowing you have a logged in user who's authenticated.
    $user_profile = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    $user = null;
// Login or logout url will be needed depending on current user state.
if ($user) {
  $logoutUrl = $facebook->getLogoutUrl(array(
'next' => 'http://unity.mppsaalk.se', // URL to which to redirect the user after logging out
} else {
  $loginUrl = $facebook->getLoginUrl(array('scope'=> 'publish_stream',  'redirect_uri' => 'http://unity.mppsaalk.se', 
) );
// This call will always work since we are fetching public data.
$naitik = $facebook->api('/naitik');
<!doctype html>
<html xmlns:fb="http://www.facebook.com/2008/fbml">
      body {
        font-family: 'Lucida Grande', Verdana, Arial, sans-serif;
      h1 a {
        text-decoration: none;
        color: #3b5998;
      h1 a:hover {
        text-decoration: underline;
    <?php if ($user): ?>
      <a href="<?php echo $logoutUrl; ?>">Logout</a>
    <?php else: ?>
        Login using OAuth 2.0 handled by the PHP SDK:
        <a href="<?php echo $loginUrl; ?>">Login with Facebook</a>
    <?php endif ?>
    <h3>PHP Session</h3>
    <pre><?php print_r($_SESSION); ?></pre>
    <?php if ($user): ?>
      <img src="https://graph.facebook.com/<?php echo $user; ?>/picture">
      <h3>Your User Object (/me)</h3>
      <pre><?php print_r($user_profile); ?></pre>
    <?php else: ?>
      <strong><em>You are not Connected.</em></strong>
    <?php endif ?>
    <h3>Public profile of Naitik</h3>
    <img src="https://graph.facebook.com/naitik/picture">
    <?php echo $naitik['name']; ?>
and i get this message


Warning: session_start() [function.session-start]: open(/storage/content/70/173870/unity.mppsaalk.se/sessions/sess_bfk38f6sm7l6o2j6380ai1fvp1, O_RDWR) failed: No such file or directory (2) in /storage/content/70/173870/unity.mppsaalk.se/public_html/examples/facebook.php on line 49
Login using OAuth 2.0 handled by the PHP SDK: Login with Facebook
PHP Session
    [fb_567618623258914_state] => d9bad0470cfe40c4939d70d686e8d420
You are not Connected.
Public profile of Naitik
 Naitik Shah 
Warning: Unknown: open(/storage/content/70/173870/unity.mppsaalk.se/sessions/sess_bfk38f6sm7l6o2j6380ai1fvp1, O_RDWR) failed: No such file or directory (2) in Unknown on line 0
Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/storage/content/70/173870/unity.mppsaalk.se/sessions) in Unknown on line 0
and when i click on "login with Facebook ", i get this from Facebook:


An error occurred. Please try again later.
API Error Code: 191
API Error Description: The specified URL is not owned by the application
Error Message: Invalid redirect_uri: Given URL is not allowed by the Application configuration.
Edited by shiniie
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