Fatal error: Uncaught Error: Non-static method SessionRating::getForUserAndSession() cannot be called statically in /web/html/camp/2020/code/class_session.php:427 Stack trace: #0 /web/html/camp/2020/session.php(167): Session->userCanRate() #1 /web/html/camp/2020/_wrapper.php(6): include('...') #2 {main} thrown in /web/html/camp/2020/code/class_session.php on line 427