Custom post type archive does not work

I have created a custom post type “video” (see my functions.php below) and it should return an archive on mysite.com/video but instead I get a 404.

**Functions.php**

// Video's
    add_action( 'init', 'register_cpt_video' );

    function register_cpt_video() {

        $labels = array(
            'name' => _x( 'Video\'s', 'video' ),
            'singular_name' => _x( 'Video', 'video' ),
            'add_new' => _x( 'Voeg nieuwe toe', 'video' ),
            'add_new_item' => _x( 'Voeg nieuwe video toe', 'video' ),
            'edit_item' => _x( 'Bewerk video', 'video' ),
            'new_item' => _x( 'Nieuwe video', 'video' ),
            'view_item' => _x( 'Bekijk video', 'video' ),
            'search_items' => _x( 'Zoek video\'s', 'video' ),
            'not_found' => _x( 'Geen video\'s gevonden', 'video' ),
            'not_found_in_trash' => _x( 'Geen video\'s in de prullenbak gevonden', 'video' ),
            'parent_item_colon' => _x( 'Parent Video:', 'video' ),
            'menu_name' => _x( 'Video\'s', 'video' ),
        );

        $args = array(
            'labels' => $labels,
            'hierarchical' => true,
            'description' => 'Gebruik dit posttype om video\'s te posten',
            'supports' => array( 'title', 'editor', 'excerpt', 'thumbnail', 'comments', 'page-attributes' ),
            'taxonomies' => array( 'post_tag' ),
            'public' => true,
            'show_ui' => true,
            'show_in_menu' => true,
            'menu_position' => 11,

            'show_in_nav_menus' => true,
            'publicly_queryable' => true,
            'exclude_from_search' => false,
            'has_archive' => true,
            'query_var' => true,
            'can_export' => true,
            'rewrite' => array(
                'slug' => 'videos',
                'with_front' => true,
                'feeds' => true,
                'pages' => true
            ),
            'capability_type' => 'page'
        );

        register_post_type( 'video', $args );
    }

I am working with Buttercream as a parent theme.

I have a similar cpt (“foto”) and that one does work flawlessly. Very strange. Is this a conflict with buttercream?