Custom Post Type Permalink Page Not Found

I’ve been wasting hours and hours trying to solve a permalink issue with custom post types. It keeps returning page not found (404). When I use the default permalinks, it works, but when I switch to post-name, it breaks. I have tried changing the slug name, flush rewrite, disabling all plug-ins, a ‘custom post type permalink’ plug-in all to no gain.

Anyone have similar issues? I’m on the latest 4.0.1 version of WordPress and here is my code from functions.php:

function authors_post_type() {
    $labels = array(
        'name'              => _x('Authors', 'post type general name'),
        'singular_name'     => _x('Author', 'post type singular name'),
        'add_new'           => _x('Add New', 'author'),
        'add_new_item'      => __('Add New Author'),
        'edit_item'         => __('Edit Author'),
        'new_item'          => __('New Author'),
        'all_items'         => __('All Authors'),
        'view_item'         => __('View Author'),
        'search_items'      => __('Search Authors'),
        'not_found'         => __('No authors found'),
        'menu_name'         => __('Authors')
    );
    $args = array(
        'labels'             => $labels,
        'public'             => true,
        'publicly_queryable' => true,
        'menu_position'     => 5,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array( 'slug' => 'authors' ),
        'capability_type'    => 'post',
        'has_archive'        => true,
        'hierarchical'       => true,
        'menu_position'      => null,
        'supports'           => array( 'title', 'editor', 'author', 'thumbnail' )
    );
    register_post_type('authors', $args);
}
add_action('init', 'authors_post_type');

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Every time while you create new post type with code (plugins do that automatically) you have to rebuild/update you permalink on Settings – Permalink.

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