Populate categories for custom post type

Hi there!

In my Wordpress theme I want to have a custom post type and for that custom post type some categories. My problem is how to get the actual values for the categories into the database. As far as I understood it I have to populate the category values when the theme is activated. I tried that but I might be doing something completely wrong (see code below).

When I try to use my code the custom post type and the category are visible but there are no values in my category. I would expect to see "Sales" and "Rental" in there.

I debugged it a little and found that the call to wp_insert_term returns an error:
object(WP_Error)#124 (2) { ["errors":"WP_Error":private]=> array(1) { ["invalid_taxonomy"]=> array(1) { [0]=> string(16) "Invalid taxonomy" } } ["error_data":"WP_Error":private]=> array(0) { } }


As far as I see it this is clear because callbacks in 'after_setup_theme' are executed before callbacks in 'init'. Since my custom post type is registered in 'init' and the call to wp_insert_term is before that, it must fail. But I also read that custom post types should be registered in 'init' and not in 'after_setup_theme'. So I am stuck here!

I am completely confused how to set this up correctly. Can somebody please explain to be how setting up a custom post type with categories is supposed to be done?

Many thanks in advance,
Dirk.
 
functions.php:

require_once ('libs/theme-setup.php');
require_once ('libs/navwalker.php');

add_action('after_setup_theme', 'wp_estate_init');
function wp_estate_init() {
  wp_theme_setup();    
}

add_action('init', 'ps_create_property_type');
function ps_create_property_type() {

    register_post_type('ps_immobilie', array(
        'labels' => array(
            'name'                  => __('Immobilien','ps_immobilie'),
            'singular_name'         => __('Immobilie','ps_immobilie'),
            'add_new'               => __('Neue Immobilie','ps_immobilie'),
            'add_new_item'          => __('Neu','ps_immobilie'),
            'edit'                  => __('Bearbeiten','ps_immobilie'),
            'edit_item'             => __('Immobilie bearbeiten','ps_immobilie'),
            'new_item'              => __('Neue Immobilie','ps_immobilie'),
            'view'                  => __('Anzeigen','ps_immobilie'),
            'view_item'             => __('Immobilie anzeigen','ps_immobilie'),
            'search_items'          => __('Immobilie suchen','ps_immobilie'),
            'not_found'             => __('Keine Immobilien gefunden','ps_immobilie'),
            'not_found_in_trash'    => __('Keine Immobilie im Papierkorb gefunden','ps_immobilie'),
            'parent'                => __('Übergeordnete Immobilie','ps_immobilie')
        ),
        'public' => true,
        'has_archive' => true,
        'rewrite' => array('slug' => 'immo'),
        'supports' => array('title', 'editor', 'thumbnail'),
        'can_export' => true,
        'register_meta_box_cb' => 'ps_immobilie_add_immobilie_metaboxes'
         )
    );
    
    register_taxonomy('marketingtype_category', 'ps_immobilie', array(
        'labels' => array(
            'name'              => __('Immobilienart','ps_immobilie'),
            'add_new_item'      => __('Neue Immobilienart','ps_immobilie'),
            'new_item_name'     => __('Neue Immobilienart','ps_immobilie')
        ),
        'hierarchical'  => true,
        'query_var'     => true,
        'rewrite'       => array( 'slug' => 'immoart' )
        )
    );
	
register_nav_menu('primary', 'Hauptmenü');

add_filter( 'cmb2_meta_boxes', 'cmb2_immobilie_metaboxes' );

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theme-setup.php:

function wp_theme_setup() 
{
	if (isset($_GET['activated']) && is_admin())
	{        
        $actions = array(   'Sales',
                            'Rental'
                        );
        foreach ($actions as $key) {
            $my_cat = array(
                'description' => $key,
                'slug' => $key
            );

            if(!term_exists($key, 'marketingtype_category') ){
                wp_insert_term($key, 'marketingtype_category', $my_cat);
            }
        }
     }
}

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