[Plugin: WordPress Popular Posts] No data so far (Lo lamento, no hay información

I installed WordPress Popular Post plugin. Displayed with a widget in right-sidebar. http://www.equidistante.com.ar (website)

The plugin shows “No data so far ” or “Lo lamento, no hay información aún”

I have this code a couple of lines above /HEAD in Header.php. This is the hook?!

<?php
if ( is_singular() && get_option( ‘thread_comments’ ) )
wp_enqueue_script( ‘comment-reply’ );
wp_head();
?>

This is a newsite Im building. Almost has no traffic. I wanna make sure everything works okay..

http://wordpress.org/extend/plugins/wordpress-popular-posts/