Exception: invalid value passed. Excpecting array or object

#0 /home/data/websites/www/limburgisoleert.be/library/Dubo/Event/Proxy.php(33): Dubo_Event->setFrom(false)
#1 /home/data/websites/www/limburgisoleert.be/application/modules/default/controllers/EventController.php(50): Dubo_Event_Proxy->getByUrl('event/2010-11-3...')
#2 /home/data/websites/www/limburgisoleert.be/library/Zend/Controller/Action.php(503): EventController->showAction()
#3 /home/data/websites/www/limburgisoleert.be/library/Zend/Controller/Dispatcher/Standard.php(285): Zend_Controller_Action->dispatch('showAction')
#4 /home/data/websites/www/limburgisoleert.be/library/Zend/Controller/Front.php(934): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#5 /home/data/websites/www/limburgisoleert.be/public_html/index.php(340): Zend_Controller_Front->dispatch()
#6 {main}