Fatal error: Uncaught Error: Class "KnpU\OAuth2ClientBundle\Security\Authenticator\OAuth2Authenticator" not found in /home/iotechtniu/ioacademy/src/Security/MyFacebookAuthenticator.php:20 Stack trace: #0 {main} thrown in /home/iotechtniu/ioacademy/src/Security/MyFacebookAuthenticator.php on line 20