Error: Invalid parameter: parameter must be a non-empty string and valid URI/IRI

#0 /var/www/clients/client0/web1/web/application/modules/default/controllers/BlogController.php(103): Zend_Feed_Writer_Entry->setLink('http://www.turi...')
#1 /var/www/clients/client0/web1/web/library/Zend/Controller/Action.php(516): BlogController->rssAction()
#2 /var/www/clients/client0/web1/web/library/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('rssAction')
#3 /var/www/clients/client0/web1/web/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#4 /var/www/clients/client0/web1/web/application/bootstrap.php(253): Zend_Controller_Front->dispatch()
#5 /var/www/clients/client0/web1/web/index.php(86): Bootstrap->runApp()
#6 {main}