custom taxonomy permalink 404 problem

All of my custom taxonomies work fine but one named “genre”. Whenever I try to select one of the genre posts, I get a 404 with pretty permalinks. I’ve tried resetting the permalinks but to no avail.

The default permalink setting works but not the pretty permalinks.

Here is my code:

// setup the genre Taxonomy

add_action( 'init', 'create_genre_taxonomy', 0 );

function create_genre_taxonomy()
{
	// Book Author Taxonomy

	$labels = array(
		'name' => _x( 'Genre', 'taxonomy general name' ),
		'singular_name' => _x( 'Genre', 'taxonomy singular name' ),
		'search_items' =>  __( 'Search Genres' ),
		'popular_items' => __( 'Popular Genres' ),
		'all_items' => __( 'All Genres' ),
		'parent_item' => null,
		'parent_item_colon' => null,
		'edit_item' => __( 'Edit Genres' ),
		'update_item' => __( 'Update Genres' ),
		'add_new_item' => __( 'Add New Genre' ),
		'new_item_name' => __( 'New Genre' ),
		'separate_items_with_commas' => __( 'Separate genres with commas' ),
		'add_or_remove_items' => __( 'Add or remove genres' ),
		'choose_from_most_used' => __( 'Choose from the most used genres' ),
		'menu_name' => __( 'Genres' ),
	); 

	register_taxonomy('genre','post',array(
		'hierarchical' => false,
		'labels' => $labels,
		'show_ui' => true,
		'query_var' => true,
		'rewrite' => array( 'slug' => 'genre' ),
	));
}

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