Pagination 404 error(I have refreshed the permalinks and tried several previous options)

I found the solution.

First, in functions.php:

function mg_news_pagination_rewrite() {
add_rewrite_rule(get_option('category_base').'/page/?([0-9]{1,})/?$', 'index.php? 
pagename=".get_option("category_base').'&paged=$matches[1]', 'top');
}
add_action('init', 'mg_news_pagination_rewrite');

and then in wordpress, settings> Permalinks changes must be saved

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