torreto on "List related author on author page"

I am not expert on php and need some help about custom query on my wordpress author page.

I have no problem when using WP_User_Query, the problem is i need to combine it with $curauth

What i need to do is get related authors list with WP_User_Query that filtered with current author page as a custom field value.

here is code that got error:

// WP_User_Query arguments
$curauth = (isset($_GET['author_name'])) ? get_user_by('slug', $author_name) : get_userdata(intval($author));
$label = echo $curauth->user_login;
$args = array (
'role'           => 'contibutor',
'number'         => '10',
'order'          => 'ASC',
'orderby'        => 'display_name',
'meta_query'     => array(
    array(
        'key'       => 'user_label',
        'value'     => $label,
    ),
),
);

// The User Query
$user_query = new WP_User_Query( $args );

// The User Loop
if ( ! empty( $user_query->results ) ) {
foreach ( $user_query->results as $user ) {
    // do something
}
} else {
// no users found
}

I hope someone here can help to resolve my problem. Thank you