Fatal error: Uncaught Error: Class 'Facebook\FacebookSignedRequestFromInputHelper' not found in /home/allfirec/public_html/facebook/facebook-php-sdk-v4-4.0-dev/src/Facebook/FacebookJavaScriptLoginHelper.php:32 Stack trace: #0 {main} thrown in /home/allfirec/public_html/facebook/facebook-php-sdk-v4-4.0-dev/src/Facebook/FacebookJavaScriptLoginHelper.php on line 32