comment_form() function doesn't work WordPress

Jurre Hanema answers:

This is the "new school" comments.php template I almost always base my code upon:


<?php

if(!empty($_SERVER['SCRIPT_FILENAME']) && basename($_SERVER['SCRIPT_FILENAME']) == 'comments.php')
die();


function comment_callback($comment, $args, $depth)
{
$GLOBALS['comment'] = $comment;

?>
<li <?php comment_class(); ?> id="li-comment-<?php comment_ID() ?>">
<?php
echo get_avatar($comment, 70, get_bloginfo('template_directory').'/images/default-gravatar.png');
?>

<div class="comment-text">
<cite class="comment-author"><?php comment_author_link(); ?> schreef:</cite>
<?php comment_text(); ?>
</div>
<?php
}


if(post_password_required())
{
?>
<p class="nocomments">Voer het wachtwoord in om reacties te kunnen bekijken.</p>
<?php
return;
}


if(get_post_status(get_the_ID()) != 'publish')
{
?>
<p class="nocomments">Reacties worden actief op het moment dat de post wordt gepubliceerd.</p>
<?php
return;
}


if(have_comments())
{
?>
<ul class="commentlist">
<?php wp_list_comments(array('style' => 'ol', 'callback' => 'comment_callback')); ?>
</ul>
<?php

if(get_comment_pages_count() > 1 && get_option('page_comments'))
{
?>
<div class="comment-navigation">
<span class="nav-previous"><?php previous_comments_link('&laquo; Oudere reacties'); ?></span>
<span class="nav-next"><?php next_comments_link('Nieuwere reacties &raquo;'); ?></span>
</div> <!-- .navigation -->
<?php
}
} else
{
// this is displayed if there are no comments so far

if(!comments_open())
{
?>
<p class="nocomments">Reacties zijn gesloten.</p>
<?php
} else
{
?>
<p class="nocomments">Er zijn nog geen reacties.</p>
<?php
}
}


// Display the comment form

comment_form(
array(
'label_submit' => 'Reageer!',
'title_reply' => 'Voeg een reactie toe',
'comment_notes_after' => null
)
);

?>


Maybe you can use it as an example.

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