Warning: session_start(): Session cannot be started after headers have already been sent in /var/www/html/games/lookback/fbConfig.php on line 3

Deprecated: Facebook\FacebookApp implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /var/www/html/games/facebook-php-sdk/FacebookApp.php on line 28

Fatal error: Uncaught Facebook\Exceptions\FacebookSDKException: Sessions are not active. Please make sure session_start() is at the top of your script. in /var/www/html/games/facebook-php-sdk/PersistentData/FacebookSessionPersistentDataHandler.php:50 Stack trace: #0 /var/www/html/games/facebook-php-sdk/Helpers/FacebookRedirectLoginHelper.php(80): Facebook\PersistentData\FacebookSessionPersistentDataHandler->__construct() #1 /var/www/html/games/facebook-php-sdk/Facebook.php(318): Facebook\Helpers\FacebookRedirectLoginHelper->__construct(Object(Facebook\Authentication\OAuth2Client), NULL, NULL, NULL) #2 /var/www/html/games/lookback/fbConfig.php(30): Facebook\Facebook->getRedirectLoginHelper() #3 /var/www/html/games/lookback/index.php(13): require_once('/var/www/html/g...') #4 {main} thrown in /var/www/html/games/facebook-php-sdk/PersistentData/FacebookSessionPersistentDataHandler.php on line 50