Facebook Autentication Sorunu

<?php  
   
  	require_once( 'lib/Facebook/FacebookSession.php'); 
  	require_once( 'lib/Facebook/FacebookRequest.php'); 
  	require_once( 'lib/Facebook/FacebookResponse.php'); 
  	require_once( 'lib/Facebook/FacebookSDKException.php'); 
  	require_once( 'lib/Facebook/FacebookRequestException.php'); 
  	require_once( 'lib/Facebook/FacebookRedirectLoginHelper.php'); 
  	require_once( 'lib/Facebook/FacebookAuthorizationException.php'); 
  	require_once( 'lib/Facebook/GraphObject.php'); 
  	require_once( 'lib/Facebook/GraphUser.php'); 
  	require_once( 'lib/Facebook/GraphSessionInfo.php'); 
  	require_once( 'lib/Facebook/Entities/AccessToken.php'); 
  	require_once( 'lib/Facebook/HttpClients/FacebookCurl.php'); 
  	require_once( 'lib/Facebook/HttpClients/FacebookHttpable.php'); 
  	require_once( 'lib/Facebook/HttpClients/FacebookCurlHttpClient.php'); 
  	 
  	// USESPACES 
  	use Facebook/FacebookSession; 
  	use Facebook/FacebookRedirectLoginHelper; 
  	use Facebook/FacebookRequest; 
  	use Facebook/FacebookResponse; 
  	use Facebook/FacebookSDKException; 
  	use Facebook/FacebookRequestException; 
  	use Facebook/FacebookAuthorizationException); 
  	use Facebook/GraphObject; 
  	use Facebook/GraphUser; 
  	use Facebook/GraphSessionInfo; 
  	use Facebook/FacebookCurl; 
  	use Facebook/FacebookHttpable; 
  	use Facebook/FacebookCurlHttpClient; 
  	 
  	// PROCESS  
  	//1.Start Session 
  	session_start(); 
  	//2.Use app id,secret and redirect url 
  	$app_id = ''; 
  	$app_secret = ''; 
  	$redirect_url = 'http://likesandslaps.eu5.org'; 
  	//3.Initialize application, create helper object and get fb sess 
  	FacebookSession::setDefaultApplication($app_id,$app_secret); 
  	$helper = new FacebookRedirectLoginHelper($redirect_url); 
  	$sess = $helper->getSessionFromRedirect(); 
  	//4. if fb sess exists echo name 
  		if(isset($sess)){ 
  			//create request object, execute and capture response 
  			$request = new FacebookRequest($sess,'GET','/me'); 
  			// from response get graph object 
  			$response = $request->execute(); 
  			$graph = $response->getGraphObject(GraphUser::classname()); 
  			// use graph object methods to get user details 
  			$name = $graph->getName(); 
  			echo "hi $name"; 
  		}else{ 
  			//else echo login 
  			echo '<a href="'.$helper->getLoginUrl().'" >Login with facebook</a>' 
  		} 
  	 
  	 
  	 
  	 
  	 
  	 
  	 
  	 
  	 
   
  ?>