The generate_rating_settings_object function checks rating permissions and is called by the public rating_manager::get_ratings. But 'get_ratings' does too much and I use instead the rating_manager::get_all_rating_for_items. However, the latter doesn't call the important 'generate_rating_settings_object' which then has to be called directly for which its access level should be changed to public.

This could probably be achieved by extending rating_manager locally but if there are no risks should better done in the rating_manager class.

Change line 642 in rating/lib.php

from:

protected function generate_rating_settings_object($options) {

to:

public function generate_rating_settings_object($options) {