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Fatal error: Uncaught Facebook\FacebookSDKException: You must provide or set a default application id. in /home/chatbara/public_html/social_login/Facebook/FacebookSession.php:320 Stack trace: #0 /home/chatbara/public_html/social_login/Facebook/FacebookRedirectLoginHelper.php(75): Facebook\FacebookSession::_getTargetAppId(NULL) #1 /home/chatbara/public_html/facebook_login.php(43): Facebook\FacebookRedirectLoginHelper->__construct('yourdomainhere....') #2 {main} thrown in /home/chatbara/public_html/social_login/Facebook/FacebookSession.php on line 320