Facebook PHP SDK验证访问令牌错误

从thinkdiff.net教程开始，我建立了一个简单的测试页面(本地环境)，带有facebook登录/注销链接。如果登录，我想回显fb用户API。

我使用最新的facebook PHP SDK (v.2.1.2)。

它似乎工作，但当我注销我收到这个异常:

FacebookApiException Object
(
[result:protected] => Array
    (
        [error] => Array
            (
                [type] => OAuthException
                [message] => Error validating access token: The session is invalid because the user logged out or because auth.expireSession was invoked.
            )
    )
[message:protected] => Error validating access token: The session is invalid because the user logged out or because auth.expireSession was invoked.
[string:Exception:private] => 
[code:protected] => 0
[file:protected] => C:'wamp'www'fb'facebook.php
[line:protected] => 543
[trace:Exception:private] => Array
    (
        [0] => Array
            (
                [function] => _graph
                [class] => Facebook
                [type] => ->
                [args] => Array
                    (
                        [0] => /me
                    )
            )
        [1] => Array
            (
                [file] => C:'wamp'www'fb'facebook.php
                [line] => 492
                [function] => call_user_func_array
                [args] => Array
                    (
                        [0] => Array
                            (
                                [0] => Facebook Object
                                    (
                                        [appId:protected] => 1819654718*****
                                        [apiSecret:protected] => a2fccb8e93638b50c8d6b2**********
                                        [session:protected] => 
                                        [signedRequest:protected] => 
                                        [sessionLoaded:protected] => 1
                                        [cookieSupport:protected] => 1
                                        [baseDomain:protected] => 
                                        [fileUploadSupport:protected] => 
                                    )
                                [1] => _graph
                            )
                        [1] => Array
                            (
                                [0] => /me
                            )
                    )
            )
        [2] => Array
            (
                [file] => C:'wamp'www'fb'fb.php
                [line] => 33
                [function] => api
                [class] => Facebook
                [type] => ->
                [args] => Array
                    (
                        [0] => /me
                    )
            )
    )
[previous:Exception:private] => 
)

$fbconfig['appid']  = "18196**********";     
$fbconfig['api']  = "5c6910be575e4e688ac6d**********";     
$fbconfig['secret']  = "a2fccb8e93638b50c8d6b2**********"; 
try
{         
   include_once "facebook.php"; 
}     
catch(Exception $o)
{         
 echo '<pre>';         
 print_r($o);         
 echo '</pre>';     
}     
// Create our Application instance.     
$facebook = new Facebook(array('appId'  => $fbconfig['appid'],'secret' =>    $fbconfig['secret'],'cookie' => true));       
$session = $facebook->getSession();       
$fbme = null;     
// Session based graph API call.     
if (!empty($session)) 
{       
  d($session);
  try 
  {         
    $uid = $facebook->getUser();         
    $fbme = $facebook->api('/me');       
  } 
  catch (FacebookApiException $e) 
  {           
    d($e);       
  }    
}      
function d($d)
{         
echo '<pre>';         
print_r($d);         
echo '</pre>';     
} 

if ($fbme) 
{   
  $logoutUrl = $facebook->getLogoutUrl(); 
  echo"<a href='{$logoutUrl}'>logout</a>";
  d($fbme);
} 
else 
{   
  $loginUrl = $facebook->getLoginUrl(array('req_perms' => 'email,read_stream,user_birthday')); 
  echo"<a href='{$loginUrl}'>login</a>";
}

卢卡