Custom Post type & Taxonomy 404

Please replace the “portfolio_create_taxonomy” funcation to below code

function portfolio_create_taxonomy() {


    register_taxonomy(
        'portfolio-category',
        array( 'portfolio' ),

        array(
        'hierarchical'      => true,
        'show_ui'           => true,
        'show_admin_column' => true,
        'query_var'         => true,
         'label' => __( 'Category' ),
         'rewrite' => array( 'slug' => 'portfolio-category' ),
         'hierarchical' => true,
        )
    );
}
add_action( 'init', 'portfolio_create_taxonomy' );