Invalid controller specified (index)

#0 /home/comparag/www/extranet/library/Zend/Controller/Front.php(936): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /home/comparag/www/extranet/index.php(69): Zend_Controller_Front->dispatch()
#2 {main}