Kommentarfunktion funktioniert nicht

<?php
	if (!empty($_SERVER['SCRIPT_FILENAME']) && 'comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
		die ('Please do not load this page directly. Thanks!');
	if ( post_password_required() ) { ?>
            <h2>This post is password protected. Enter the password to view comments.</h2>
	<?php
		return;
	}
?>


            <h2 id="comments"><?php comments_number('Keine Kommentare', '1 Kommentar', '% Kommentare' );?></h2>
<?php if ( have_comments() ) : ?>
            <div class="navigation">
                <div class="next-posts"><?php previous_comments_link() ?></div>
                <div class="prev-posts"><?php next_comments_link() ?></div>
            </div>
            <ol class="commentlist">
<?php wp_list_comments('reply_text=Antworten'); ?>
            </ol>
            <div class="navigation">
                <div class="next-posts"><?php previous_comments_link() ?></div>
                <div class="prev-posts"><?php next_comments_link() ?></div>
            </div>
<?php else : // this is displayed if there are no comments so far ?>
	<?php if ( comments_open() ) : ?>
            <!-- Es gibt noch keine Kommentare -->
    <?php else : // comments are closed ?>
            <p>Kommentare nicht zugelassen.</p>
	<?php endif; ?>
<?php endif; ?>
<?php if ( comments_open() ) : ?>
            <div id="respond">
                <h2><?php comment_form_title( 'Kommentar hinzufügen', 'Kommentar hinzufügen zu %s' ); ?></h2>
                <div class="cancel-comment-reply">
                    <?php cancel_comment_reply_link(); ?>
                </div>
<?php if ( get_option('comment_registration') && !is_user_logged_in() ) : ?>
                <p>You must be <a href="<?php echo wp_login_url( get_permalink() ); ?>">logged in</a> to post a comment.</p>
<?php else : ?>
                <form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">
<?php if ( is_user_logged_in() ) : ?>
                    <p>Angemeldet als <a href="<?php echo get_option('siteurl'); ?>/wp-admin/profile.php"><?php echo $user_identity; ?></a>| <a href="<?php echo wp_logout_url(get_permalink()); ?>" title="Abmelden">Abmelden</a></p>
<?php else : ?>
                    <div>
                        <input type="text" name="author" id="author" value="<?php echo esc_attr($comment_author); ?>" size="22" tabindex="1" <?php if ($req) echo "aria-required='true'"; ?> />
                        <label for="author">Name <?php if ($req) echo "(notwendig)"; ?></label>
                    </div>
                    <div>
                        <input type="text" name="email" id="email" value="<?php echo esc_attr($comment_author_email); ?>" size="22" tabindex="2" <?php if ($req) echo "aria-required='true'"; ?> />
                        <label for="email">Mail (wird nicht veröffentlicht) <?php if ($req) echo "(notwendig)"; ?></label>
                    </div>
                    <div>
                        <input type="text" name="url" id="url" value="<?php echo esc_attr($comment_author_url); ?>" size="22" tabindex="3" />
                        <label for="url">Website</label>
                    </div>
<?php endif; ?>
                    <div>
                        <textarea name="comment" id="comment" cols="58" rows="10" tabindex="4"></textarea>
                    </div>
                    <div>
                        <input name="submit" type="submit" id="submit" tabindex="5" value="Kommentar absenden" />
                        <?php comment_id_fields(); ?>
                        <?php do_action('comment_form', $post->ID); ?>
                    </div>
                </form>
<?php endif; // If registration required and not logged in ?>
            </div>
<?php endif; ?>