Unable to find a matching route to generate url for params "array ( 'controller' => '', 'action' => NULL,)".

#0 /space/lib/releases/20130516095122/core/UrlHelper.php(13): mnRouting->generate('', Array, false)
#1 /space/lib/releases/20130516095122/templates/_nav.php(30): url_for(NULL)
#2 /space/lib/releases/20130516095122/core/PartialHelper.php(46): include('/space/lib/rele...')
#3 /space/www/www.20minutes.fr/data/releases/20130516095125/apps/cms2/modules/article/templates/showSuccess.php(44): get_partial('@nav', Array)
#4 /space/lib/releases/20130516095122/core/mnView.class.php(43): require('/space/www/www....')
#5 /space/lib/releases/20130516095122/core/mnView.class.php(26): mnView->renderFile('/space/www/www....')
#6 /space/lib/releases/20130516095122/core/mnController.class.php(270): mnView->render()
#7 /space/lib/releases/20130516095122/core/mnController.class.php(218): mnController->handleView(Array, 'Success', Array)
#8 /space/lib/releases/20130516095122/core/mnController.class.php(195): mnController->executeActionStack()
#9 /space/lib/releases/20130516095122/core/mnController.class.php(112): mnController->forward('article', 'show')
#10 /space/lib/releases/20130516095122/core/mnContext.class.php(81): mnController->dispatch()
#11 /space/www/www.20minutes.fr/data/releases/20130516095125/htdocs/cms2.php(22): mnContext::dispatch()
#12 {main}