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here is my custom post type and category:

//Register nav
register_nav_menus( array(
    'main_nav' => 'Main navigation'
) );

//Custom post types
add_action( 'init', 'create_post_type' );
function create_post_type() {
    register_post_type( 'assets',
            'labels' => array(
                'name' => __( 'Assets' ),
                'show_in_nav_menus' => true,
                'show_in_menu' => true,
                'singular_name' => __( 'Asset' )
        'public' => true,
        'has_archive' => true,

//Custom post type taxonomy/category
add_action( 'init', 'build_taxonomies', 0 );
function build_taxonomies() {
    register_taxonomy( 'categories', 'assets',
            'hierarchical' => true,
            'label' => 'Categories',
            'query_var' => true,
            'rewrite' => true

Even though I have 'show_in_nav_menus' turned on, it still won't show. Is there something wrong with my code?

It seems to work fine otherwise. Thanks

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Ugh. Fixed.

You have to show the 2nd category box in screen options, I could only see the default post categories. I'm glad I spent 40 mins trying new bits of code for that.


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