Fatal error: Uncaught Error: Class 'Facebook\Helpers\FacebookSignedRequestFromInputHelper' not found in /home/ncue/public_html/facebook/php-graph-sdk/src/Facebook/Helpers/FacebookCanvasHelper.php:31 Stack trace: #0 {main} thrown in /home/ncue/public_html/facebook/php-graph-sdk/src/Facebook/Helpers/FacebookCanvasHelper.php on line 31