I am trying to use FB login. I have used the same code for other websites and it works fine. But only one domain it returns a fatal error.
Fatal error: Uncaught 'Exception' with message 'Facebook needs the JSON PHP extension' in /var/www/vhosts/domain.com/httpdocs/base_facebook.php:22 Stack trace /var/www/vhosts/domain.com/httpdocs/facebook.php:18 require_once()#1 ....