Fatal error: Uncaught exception 'Facebook\FacebookSDKException' with message 'You must provide or set a default application id.' in /home/dentalapp/public_html/facebooklogin/src/Facebook/FacebookSession.php:320 Stack trace: #0 /home/dentalapp/public_html/facebooklogin/src/Facebook/FacebookRedirectLoginHelper.php(75): Facebook\FacebookSession::_getTargetAppId(NULL) #1 /home/dentalapp/public_html/facebooklogin/fbconfig.php(20): Facebook\FacebookRedirectLoginHelper->__construct('https://www.den...') #2 {main} thrown in /home/dentalapp/public_html/facebooklogin/src/Facebook/FacebookSession.php on line 320