SessionHandler::write(): Parent session handler is not open

I'm using FOSFacebookBundle in Symfony 2.3 as it says in the Integration with FOSUserBundle documentation. And edited `security.yml`, ran the code but I got the error: ``` Warning: SessionHandler::write(): Parent session handler is not open in /var/www/my/app/cache/dev/classes.php line 407 ``` so I gave the permissions: ``` sudo chmod 777 -R app/cache sudo chmod 777 -R app/logs ``` When I login again, and then logout page I get the same error. I see this https://github.com/symfony/symfony/issues/5868 and update the php. But this problem is not solve I don't know why ? Any one know please tell me ? `security.yml` ``` security: encoders: FOS\UserBundle\Model\UserInterface: sha512 role_hierarchy: ROLE_ADMIN: ROLE_USER ROLE_SUPER_ADMIN: ROLE_ADMIN providers: chain_provider: chain: providers: [fos_userbundle, my_fos_facebook_provider] fos_userbundle: id: fos_user.user_provider.username my_fos_facebook_provider: id: my.facebook.user firewalls: main: pattern: ^/ fos_facebook: app_url: "http://apps.facebook.com/xxxx/" server_url: "http://symfony/app_dev.php/login" login_path: /login check_path: /loginFb default_target_path: / provider: my_fos_facebook_provider form_login: login_path: /login check_path: /login_check provider: fos_userbundle logout: true anonymous: true access_control: - { path: ^/secured/.*, role: [IS_AUTHENTICATED_FULLY] } - { path: ^/.*, role: [IS_AUTHENTICATED_ANONYMOUSLY] } - { path: ^/login$, role: IS_AUTHENTICATED_ANONYMOUSLY } - { path: ^/register, role: IS_AUTHENTICATED_ANONYMOUSLY } - { path: ^/resetting, role: IS_AUTHENTICATED_ANONYMOUSLY } - { path: ^/admin/, role: ROLE_ADMIN } ```