Пользовательский тип записи в WordPress — невозможно отобразить метабоксы

Мне удалось получить раздел «Диспетчер транспортных средств» для загрузки слева, чтобы я мог создать собственный тип сообщения, но не могу отобразить мета-поля для ввода пользовательской информации для этого типа сообщения (если это имеет смысл ).

Вот мой автомобиль-manager.php:

<?php
add_action('init', 'vehicle_manager_register');
function vehicle_manager_register()
{
//Arguments to create post type.
$args = array(
'label' => __('Vehicle Manager'),
'singular_label' => __('Vehicle'),
'public' => true,
'show_ui' => true,
'capability_type' => 'post',
'hierarchical' => true,
'has_archive' => true,
'supports' => array(
'title',
'editor',
'thumbnail'
),
'rewrite' => array(
'slug' => 'vehicles',
'with_front' => false
)
);
//Register type and custom taxonomy for type.
register_post_type('vehicle', $args);
register_taxonomy("vehicle-type", array(
"vehicles"), array(
"hierarchical" => true,
"label" => "Vehicle Types",
"singular_label" => "Vehicle Type",
"rewrite" => true,
"slug" => 'vehicle-type'
));
}
//Begin custom fields
if (function_exists('add_theme_support')) {
add_theme_support('post-thumbnails');
set_post_thumbnail_size(220, 150);
add_image_size('storefront', 800, 600, true);
}
add_action("admin_init", "vehicle_manager_add_meta");
function vehicle_manager_add_meta()
{
add_meta_box("vehicle-meta", "Vehicle Options", "vehicle_manager_meta_options", "vehicles", "normal", "high");
}
//Start of actual custom fields
function vehicle_manager_meta_options()
{
global $post;
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
return $post_id;
$custom  = get_post_custom($post->ID);
$make    = $custom["make"][0];
$model   = $custom["model"][0];
$year    = $custom["year"][0];
$mileage = $custom["mileage"][0];
$engine  = $custom["engine"][0];
$colour  = $custom["colour"][0];
$price   = $custom["price"][0];
$uspa    = $custom["uspa"][0];
$uspb    = $custom["uspb"][0];
$uspc    = $custom["uspc"][0];
?>
<style type="text/css">
<?php
include('vehicle-manager.css');
?>
</style>
<div class="vehicle_manager_extras">
<div><label>Make:</label><input name="make"value="<?php
echo $make;
?>" /></div>
<div><label>Model</label><input name="model"value="<?php
echo $model;
?>" /></div>
<div><label>Year:</label><input name="year"value="<?php
echo $year;
?>" /></div>
<div><label>Miles:</label><input name="miles"value="<?php
echo $miles;
?>" /></div>
<div><label>Engine:</label><input name="engine"value="<?php
echo $engine;
?>" /></div>
<div><label>Colour:</label><input name="colour"value="<?php
echo $colour;
?>" /></div>
<div><label>Price:</label><input name="price"value="<?php
echo $price;
?>" /></div>
<div><label>Feature 1 (optional):</label><input name="uspa"value="<?php
echo $uspa;
?>" /></div>
<div><label>Feature 2 (optional):</label><input name="uspb"value="<?php
echo $uspb;
?>" /></div>
<div><label>Feature 3 (optional):</label><input name="uspc"value="<?php
echo $uspc;
?>" /></div>
</div>
<?php
}
add_action('save_post', 'business_manager_save_extras');
function business_manager_save_extras()
{
global $post;
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
//if you remove this the sky will fall on your head.
return $post_id;
} else {
update_post_meta($post->ID, "make", $_POST["make"]);
update_post_meta($post->ID, "model", $_POST["model"]);
update_post_meta($post->ID, "year", $_POST["year"]);
update_post_meta($post->ID, "miles", $_POST["miles"]);
update_post_meta($post->ID, "engine", $_POST["engine"]);
update_post_meta($post->ID, "colour", $_POST["colour"]);
update_post_meta($post->ID, "price", $_POST["price"]);
update_post_meta($post->ID, "uspa", $_POST["uspa"]);
update_post_meta($post->ID, "uspb", $_POST["uspb"]);
update_post_meta($post->ID, "uspc", $_POST["uspc"]);
}
}

Вот функции.php:

<?php
require_once('vehicle-manager.php');
define('TEMPPATH', get_bloginfo('stylesheet_directory'));
define('IMAGES', TEMPPATH . "/images");
add_theme_support('nav-menus');
if (function_exists('register_nav_menus')) {
register_nav_menus(array(
'main' => 'Main Nav'
));
}
if (function_exists('register_sidebar')) {
register_sidebar(array(
'name' => __('Primary Sidebar', 'primary-sidebar'),
'id' => 'primary-widget-area',
'description' => __('The primary widget area', 'dir'),
'before_widget' => '<div class="widget">',
'after_widget' => "</div>",
'before_title' => '<h3 class="widget-title">',
'after_title' => '</h3>'
));
}
16;
?>