Shortcode not working for latest updated

Hi,

The code for the shortocde was working in the older plugin version. However, since the lastest updated the shortcode is not showing up anymore.

function my_wpdiscuz_shortcode() {
if (file_exists(ABSPATH . ‘wp-content/plugins/wpdiscuz/templates/comment/comment-form.php’)) {
ob_start();
include_once ABSPATH . ‘wp-content/plugins/wpdiscuz/templates/comment/comment-form.php’;
return ob_get_clean();
}
}
add_shortcode(‘wpdiscuz_comments’, ‘my_wpdiscuz_shortcode’);

Thanks