Shortcode Not Working

The new updated shortcode doesn’t work at all.

function my_wpdiscuz_shortcode() {
$html = “”;
if (file_exists(ABSPATH . “wp-content/plugins/wpdiscuz/themes/default/comment-form.php”)) {
ob_start();
include_once ABSPATH . “wp-content/plugins/wpdiscuz/themes/default/comment-form.php”;
$html = ob_get_clean();
}
return $html;
}
add_shortcode(“wpdiscuz_comments”, “my_wpdiscuz_shortcode”);

and using [wpdiscuz_comments] with it.