Fatal error: Uncaught Error: Interface "Facebook\PersistentData\PersistentDataInterface" not found in /home2/cp334332/public_html/examcenter/vendor/facebook/graph-sdk/src/Facebook/PersistentData/FacebookSessionPersistentDataHandler.php:33 Stack trace: #0 {main} thrown in /home2/cp334332/public_html/examcenter/vendor/facebook/graph-sdk/src/Facebook/PersistentData/FacebookSessionPersistentDataHandler.php on line 33