An error occurred

An error occurred:

Invalid controller specified (sitemap.xml)
#0 /var/www/application/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /var/www/html/index.php(29): Zend_Controller_Front->dispatch()
#2 {main}