Invalid controller specified (sitemap.xml)

Stack trace
'#0 /var/www/ya_tut/slavyanochka-rukodelnica.ru/lib/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /var/www/ya_tut/slavyanochka-rukodelnica.ru/wb/htdocs/index.php(14): Zend_Controller_Front->dispatch()
#2 {main}'
Request Params
array (
  'controller' => 'sitemap.xml',
  'action' => 'index',
  'module' => 'default',
)

Exception block
   243	         */
   244	        if (!$this->isDispatchable($request)) {
   245	            $controller = $request->getControllerName();
   246	            if (!$this->getParam('useDefaultControllerAlways') && !empty($controller)) {
   247	                require_once 'Zend/Controller/Dispatcher/Exception.php';
>>>248	                throw new Zend_Controller_Dispatcher_Exception('Invalid controller specified (' . $request->getControllerName() . ')');
   249	            }
   250	
   251	            $className = $this->getDefaultControllerClass($request);
   252	        } else {
   253	            $className = $this->getControllerClass($request);