Fatal error: Uncaught Error: Class 'Facebook\Helpers\FacebookCanvasHelper' not found in /var/www/html/yourfaithfully/vendor/facebook/graph-sdk/src/Facebook/Helpers/FacebookPageTabHelper.php:34 Stack trace: #0 {main} thrown in /var/www/html/yourfaithfully/vendor/facebook/graph-sdk/src/Facebook/Helpers/FacebookPageTabHelper.php on line 34