shortcode dosen’t work after update 7 version

Hello
I’ve used the following code for shortcodes before and it worked fine!!!!!
But now!
after updating the plugin, this code dose not works and the commentes are not displayed!!!!

function my_wpdiscuz_shortcode() {
   if(file_exists(ABSPATH . 'wp-contents/plugins/wpdiscuz/templates/comment/comment-form.php')){
      include_once ABSPATH . 'wp-contents/plugins/wpdiscuz/templates/comment/comment-form.php';
   }
}
add_shortcode( 'wpdiscuz_comments', 'my_wpdiscuz_shortcode' );

The page I need help with: [log in to see the link]