Fatal error: Uncaught Error: Call to undefined function add_shortcode() in /nfs/bronfs/uwfs/hw00/d73/eph/wordpress/wp-content/plugins/jetpack/modules/shortcodes/tweet.php:21 Stack trace: #0 {main} thrown in /nfs/bronfs/uwfs/hw00/d73/eph/wordpress/wp-content/plugins/jetpack/modules/shortcodes/tweet.php on line 21