Fatal error: Uncaught Error: Call to undefined function add_shortcode() in /home/k1818436/public_html/wp-content/plugins/pdf-viewer-for-wordpress/includes/tnc_shortcodes.php:139 Stack trace: #0 {main} thrown in /home/k1818436/public_html/wp-content/plugins/pdf-viewer-for-wordpress/includes/tnc_shortcodes.php on line 139