Fatal error: Uncaught Error: Call to undefined function add_shortcode() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/_pdf-viewer-for-wordpress/includes/tnc_shortcodes.php:114 Stack trace: #0 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/_pdf-viewer-for-wordpress/includes/tnc_shortcodes.php on line 114