Fatal error: Uncaught Error: Interface 'Facebook\PersistentData\PersistentDataInterface' not found in /home/tsaipeigroup/public_html/STRUCTURE/FacebookSDK/PersistentData/FacebookSessionPersistentDataHandler.php:33 Stack trace: #0 {main} thrown in /home/tsaipeigroup/public_html/STRUCTURE/FacebookSDK/PersistentData/FacebookSessionPersistentDataHandler.php on line 33