Custom post, taxonomy, and role

$coupon_manager = add_role("coupon_manager", "Coupon Manager");
$coupon_manager->add_cap( 'edit_coupons' );
$coupon_manager->add_cap( 'edit_coupon' );
$coupon_manager->add_cap( 'delete_coupon' );
$coupon_manager->add_cap( 'delete_coupons' );
$coupon_manager->add_cap( 'read_coupons' );
$coupon_manager->add_cap( 'upload_files' );
$coupon_manager->add_cap( 'read' );


$labels = array(
	'name' => _x('Coupons', 'post type general name'),
	'singular_name' => _x('Coupon', 'post type singular name'),
	'add_new' => _x('Add Coupon', 'coupon'),
	'add_new_item' => __('Add New Coupon'),
	'edit_item' => __('Edit Coupon'),
	'new_item' => __('New Coupon'),
	'view_item' => __('View Coupon'),
	'search_items' => __('Search Coupons'),
	'not_found' =>  __('No coupons found'),
	'not_found_in_trash' => __('No coupons found in Trash'),
	'parent_item_colon' => '',
	'parent' => 'Parent Coupon'
);
$args = array(
	'labels' => $labels,
	'public' => true,
	'publicly_queryable' => true,
	'_builtin' => false,
	'show_ui' => true,
	'query_var' => true,
	'rewrite' => array('slug'=>'coupon'),
	'hierarchical' => false,
	'menu_position' => null,
	'taxonomies' => array('couponbook'),
	'supports' => array('title','author','thumbnail','page-attributes','revisions'),
	'capability_type' => 'coupon'
);
register_post_type('coupon',$args);


$labels = array(
	'name' => _x( 'Coupon Books', 'taxonomy general name' ),
	'singular_name' => _x( 'Coupon Book', 'taxonomy singular name' ),
	'search_items' =>  __( 'Search Coupon Books' ),
	'all_items' => __( 'All Coupon Books' ),
	'parent_item' => __( 'Parent Coupon Book' ),
	'parent_item_colon' => __( 'Parent Coupon Book:' ),
	'edit_item' => __( 'Edit Coupon Book' ),
	'update_item' => __( 'Update Coupon Book' ),
	'add_new_item' => __( 'Add New Coupon Book' ),
	'new_item_name' => __( 'New Coupon Book Name' )
);

$settings = array(
	'hierarchical' => true,
	'capability_type' => 'couponbook',
	'labels' => $labels,
	'show_ui' => true,
	'rewrite' => array( 'slug' => 'couponbook' )
);

register_taxonomy('couponbook', array('coupon'), $settings);