Fatal error: Uncaught Error: Call to undefined function add_shortcode() in /home/flguru/addons/guruspace.com/public_html/wp-content/plugins/magee-shortcodes/shortcodes/class-image-compare.php:13 Stack trace: #0 /home/flguru/addons/guruspace.com/public_html/wp-content/plugins/magee-shortcodes/shortcodes/class-image-compare.php(48): Magee_Image_Compare->__construct() #1 {main} thrown in /home/flguru/addons/guruspace.com/public_html/wp-content/plugins/magee-shortcodes/shortcodes/class-image-compare.php on line 13