我有一个Facebook应用程序，使用登录Facebook功能，该功能较早，现在还没有。
我使用以下代码获取登录URL：
$fb_helper = $login_providers['fb']->getRedirectLoginHelper();
$fb_login_url = $fb_helper->getLoginUrl(/* my callback URL */, array('email'));
在回调网址上，我然后使用$ fb_helper-＆gt; getAccessToken返回以下异常。
Fatal error: Uncaught exception 'Facebook\Exceptions\FacebookAuthenticationException' with message '(#100) The parameter input_token is required' in /home/kgur5734/public_html/left/system/libraries/Facebook/Exceptions/FacebookResponseException.php:100
Stack trace:
#0 /home/kgur5734/public_html/left/system/libraries/Facebook/FacebookResponse.php(210): Facebook\Exceptions\FacebookResponseException::create(Object(Facebook\FacebookResponse))
#1 /home/kgur5734/public_html/left/system/libraries/Facebook/FacebookResponse.php(255): Facebook\FacebookResponse->makeException()
#2 /home/kgur5734/public_html/left/system/libraries/Facebook/FacebookResponse.php(82): Facebook\FacebookResponse->decodeBody()
#3 /home/kgur5734/public_html/left/system/libraries/Facebook/FacebookClient.php(225): Facebook\FacebookResponse->__construct(Object(Facebook\FacebookRequest), '{"error":{"mess...', 400, Array)
#4 /home/kgur5734/public_html/left/system/libraries/Facebook/Authentication/OAuth2Client.php(118): Facebook\FacebookClient->sendRequest(Object(F in /home/kgur5734/public_html/left/system/libraries/Facebook/Exceptions/FacebookResponseException.php on line 100
任何想法，Stack Overflow？