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When I try to login to register my production server I get the following error – Fatal error: Uncaught Error: Call to undefined function json_last_error() in /var/www/html/abc/wp-content/plugins/miniorange-saml-20-single-sign-on/login.php:960

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Could you please install json using the following command in your terminal and restart your apache :
sudo apt-get install php5-json