WordPress PageNavi Plugin not working in category.php

I had the same problem but you just have to put the native loop in category.php which is this:

<?php if ( have_posts() ) : while ( have_posts() ) : the_post();  ?>

then put the function of the plugin:

<?php endwhile; wp_pagenavi(); endif; ?>

Also check in reading settings, how many posts you want to show.

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