I am using the below code for rename author base, But its not working for me. I already save Settings>>permalinks from admin section.

Please let me know what error in below code.

add_action('init','change_author_base_permalinks');
function change_author_base_permalinks()
{
    global $wp_rewrite;
    $wp_rewrite->author_base = 'hire'; // Change 'member' to be the base URL you wish to use
    $wp_rewrite->author_structure = '/' . $wp_rewrite->author_base. '/%author%';
}