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:
    0.0002     632160   1. {main}() /var/www/index.php:0
    0.0053     954976   2. Router::process() /var/www/index.php:4
    0.0123    1431664   3. Router->run() /var/www/lib/classes/Router.php:47
    0.0124    1432952   4. Controller->run() /var/www/lib/classes/Router.php:26
    0.0124    1433096   5. EventsController->action_Show() /var/www/lib/classes/controllers/Controller.php:26
    0.0195    2118944   6. Controller->render() /var/www/lib/classes/controllers/EventsController.php:28
    0.0196    2121464   7. include('/var/www/includes/events/show.ics.php') /var/www/lib/classes/controllers/Controller.php:99
    0.0197    2154520   8. include('/var/www/includes/events/index.ics.php') /var/www/includes/events/show.ics.php:3