Error

You need a site logo, it is in the FAQ https://ww.wp.xz.cn/plugins/wp-postratings/#faq (2nd Q)

<?php
add_filter( 'wp_postratings_site_logo', 'wp_postratings_site_logo' );
function wp_postratings_site_logo( $url ) {
return 'http://placehold.it/350/150.png';
}
?>