Fatal error: Uncaught Error: Interface "Facebook\HttpClients\FacebookHttpClientInterface" not found in /home2/cp334332/public_html/examcenter/vendor/facebook/graph-sdk/src/Facebook/HttpClients/FacebookStreamHttpClient.php:29 Stack trace: #0 {main} thrown in /home2/cp334332/public_html/examcenter/vendor/facebook/graph-sdk/src/Facebook/HttpClients/FacebookStreamHttpClient.php on line 29