Fixing error 404 on news/page/2 Wordpress

functions.php

<?php
/*============== ERROR 404 news/page/2/ ======================*/
    function remove_query_string($query_string)
    {
        if ($query_string['name'] == 'page' && isset($query_string['page'])) {
            unset($query_string['name']);
            $query_string['paged'] = $query_string['page'];
        }
        return $query_string;
    }
    add_filter('request', 'remove_query_string');
/*========================================================*/
// https://wordpress.stackexchange.com/a/321209
?>