Taxonomy page 404

Hi all,

I’m busy with a CPT and added a taxonomy.

The name of my CPT is “projecten” and the name of my taxonomy is “landen”.

So if i go to https://mywebsite/projecten I get a archive page. I added a new archive file archive-projecten.php.

So far, so good.

But when I go to my taxonomy page https://mywebsite/landen I get a 404 page. I created taxonomy-landen.php but nothing seems to work.

I flushed my permalink settings but no effect.

So now I was hoping somebody could help me out.

add_action('init', 'project_custom_init');  

	/*-- Custom Post Init Begin --*/
	function project_custom_init()
	{
	  $labels = array(
		'name' => __( 'Projecten','structure'),
		'singular_name' => __( 'Project','structure' ),
		'add_new' => __('Voeg toe','structure'),
		'add_new_item' => __('Voeg nieuw project toe','structure'),
		'edit_item' => __('Bewerk project','structure'),
		'new_item' => __('Nieuw project','structure'),
		'view_item' => __('Bekijk project','structure'),
	    'all_items' => __('Alle Items'),
		'search_items' => __('Zoek in projecten','structure'),
		'not_found' =>  __('Geen projecten gevonden','structure'),
		'not_found_in_trash' => __('Geen projecten gevonden in de prullenbak','structure'),

	  );

	 $args = array(
		'labels' => $labels,
		'public' => true,
		'exclude_from_search' => false,
		'publicly_queryable' => true,
		'show_ui' => true,
		'query_var' => true,
		'capability_type' => 'post',
		'hierarchical' => true,
		'menu_position' => null,
		'supports' => array('title','editor','thumbnail', 'page-attributes','excerpt'),
	  	'rewrite' => array('hierarchical' => true ),
		'has_archive' => true,

	  );
	  // The following is the main step where we register the post.
	  register_post_type('projecten',$args);

	  // Initialize New Taxonomy Labels
	  $labels = array(
        'name' => __( 'Landen', 'structure' ),
        'singular_name' => __( 'Landen', 'structure' ),
        'search_items' =>  __( 'Zoek in landen', 'structure' ),
        'popular_items' => __( 'Populaire landen', 'structure' ),
        'all_items' => __( 'Alle landen', 'structure' ),
        'parent_item' => __( 'Hoofd land', 'structure' ),
        'parent_item_colon' => __( 'Hoofd land:', 'structure' ),
        'edit_item' => __( 'Bewerk land', 'structure' ),
        'update_item' => __( 'Update land', 'structure' ),
        'add_new_item' => __( 'Voeg nieuw land toe', 'structure' ),
        'new_item_name' => __( 'Nieuwe naam van land', 'structure' ),
        'separate_items_with_commas' => __( 'Scheid landen met een comma', 'structure' ),
        'add_or_remove_items' => __( 'Add or remove portfolio types', 'structure' ),
        'choose_from_most_used' => __( 'Choose from the most used portfolio types', 'structure' ),
        'menu_name' => __( 'Landen', 'structure' )
	  );
		// Custom taxonomy for Project Tags
		register_taxonomy('landen',array('projecten'), array(
		'hierarchical' => true,
		'labels' => $labels,
		'show_ui' => true,
		'query_var' => true,
		'rewrite' => array( 'slug' => 'landen' ),
	  ));

	}