Comments not display

Hi,

I use careerfy theme, in this theme, there is a custom post page (job) for each user

On this page, I want to display comments

I have added a custom hook, and then call it from the page file.

shortcode in function.php

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");

inside the file I have added:

echo do_shortcode("[wpdiscuz_comments]");

but unfortunately, I get this

I have enabled comments from WordPress setting, comments work fine on posts

help please