Invalid controller specified (robots.txt)

#0 /var/www/stickyprice.com/library/Zend/Controller/Front.php(946): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#1 /var/www/stickyprice.com/htdocs/index.php(193): Zend_Controller_Front->dispatch()
#2 {main}