Fatal error: Call to a member function get_UID() on a non-object in /var/www/includes/events/index.ics.php on line 40

Call Stack:
    0.0001     632128   1. {main}() /var/www/index.php:0
    0.0027     954928   2. Router::process() /var/www/index.php:4
    0.0092    1431744   3. Router->run() /var/www/lib/classes/Router.php:47
    0.0092    1433000   4. Controller->run() /var/www/lib/classes/Router.php:26
    0.0092    1433144   5. EventsController->action_Show() /var/www/lib/classes/controllers/Controller.php:26
    0.0156    2118864   6. Controller->render() /var/www/lib/classes/controllers/EventsController.php:28
    0.0157    2121384   7. include('/var/www/includes/events/show.ics.php') /var/www/lib/classes/controllers/Controller.php:99
    0.0159    2154400   8. include('/var/www/includes/events/index.ics.php') /var/www/includes/events/show.ics.php:3