comment_form() Function Not Working

Hello,
I am now working on developing WordPress template,
and I am having this problem : comment_form() Not working with me !

• They appear but do not work
• Fill out the data and do not send it

comments.php File :

<?php

    // Whether the current post is open for comments.

    if (comments_open()) {
        // Display comments
        wp_list_comments( array(
        	'callback' => 'tuhfa_comments_template_calback'
        ) );

        comment_form();

    }else {

        echo "Closed";

    }

?>

Please Help Me.