creating custom wordpress posts twenty fourteen

hey, I’m using twenty fourteen and attempting to create custom post types. I’m following this guide and have added the code below to my functions php file and nothing is happening, I really don’t understand what is going wrong!

// Creates Movie Reviews Custom Post Type
function movie_reviews_init() {
    $args = array(
      'label' => 'Movie Reviews',
        'public' => true,
        'show_ui' => true,
        'capability_type' => 'post',
        'hierarchical' => false,
        'rewrite' => array('slug' => 'movie-reviews'),
        'query_var' => true,
        'menu_icon' => 'dashicons-video-alt',
        'supports' => array(
            'title',
            'editor',
            'excerpt',
            'trackbacks',
            'custom-fields',
            'comments',
            'revisions',
            'thumbnail',
            'author',
            'page-attributes',)
        );
    register_post_type( 'movie-reviews', $args );
}
add_action( 'init', 'movie_reviews_init' );

Any help would be greatly appreciated!
Many thanks,
UrbanFix