以下のエラーが発生しました

Zend_Controller_Response_Http Object ( [_body:protected] => Array ( ) [_exceptions:protected] => Array ( [0] => Zend_Controller_Dispatcher_Exception Object ( [message:protected] => Invalid controller specified (robots.txt) [string:private] => [code:protected] => 0 [file:protected] => /srv/www/magician.jp/htdocs/product/libs/Zend/Controller/Dispatcher/Standard.php [line:protected] => 249 [trace:private] => Array ( [0] => Array ( [file] => /srv/www/magician.jp/htdocs/product/libs/Zend/Controller/Front.php [line] => 915 [function] => dispatch [class] => Zend_Controller_Dispatcher_Standard [type] => -> [args] => Array ( [0] => Zend_Controller_Request_Http Object ( [_paramSources:protected] => Array ( [0] => _GET [1] => _POST ) [_requestUri:protected] => /robots.txt [_baseUrl:protected] => [_basePath:protected] => [_pathInfo:protected] => /robots.txt [_params:protected] => Array ( [controller] => robots.txt [action] => index [module] => default [error_handler] => ArrayObject Object ( [exception] => Zend_Controller_Dispatcher_Exception Object *RECURSION* [type] => EXCEPTION_NO_CONTROLLER [request] => Zend_Controller_Request_Http Object ( [_paramSources:protected] => Array ( [0] => _GET [1] => _POST ) [_requestUri:protected] => /robots.txt [_baseUrl:protected] => [_basePath:protected] => [_pathInfo:protected] => /robots.txt [_params:protected] => Array ( [controller] => robots.txt [action] => index [module] => default ) [_aliases:protected] => Array ( ) [_dispatched:protected] => 1 [_module:protected] => default [_moduleKey:protected] => module [_controller:protected] => robots.txt [_controllerKey:protected] => controller [_action:protected] => index [_actionKey:protected] => action ) ) ) [_aliases:protected] => Array ( ) [_dispatched:protected] => 1 [_module:protected] => default [_moduleKey:protected] => module [_controller:protected] => error [_controllerKey:protected] => controller [_action:protected] => error [_actionKey:protected] => action ) [1] => Zend_Controller_Response_Http Object *RECURSION* ) ) [1] => Array ( [file] => /srv/www/magician.jp/htdocs/product/libs/Zend/Controller/Front.php [line] => 223 [function] => dispatch [class] => Zend_Controller_Front [type] => -> [args] => Array ( ) ) [2] => Array ( [file] => /srv/www/magician.jp/htdocs/product/www/html/index.php [line] => 23 [function] => run [class] => Zend_Controller_Front [type] => :: [args] => Array ( [0] => ../controllers ) ) ) ) ) [_headers:protected] => Array ( ) [_headersRaw:protected] => Array ( ) [_httpResponseCode:protected] => 200 [_isRedirect:protected] => [_renderExceptions:protected] => [headersSentThrowsException] => 1 )