some error with ARO/ACO ACL

i use cakephp(v1.3.7) ACL i have this error:

Warning (512): DbAcl::check() - Failed ARO/ACO node lookup in
permissions check. Node references:
Aro: Array
(
[User] => Array
(
[id] => 1
[username] => root
[group_id] => 1
[created] => 2011-02-01 07:19:20
[modified] => 2011-02-01 07:50:36
)

)

Aco: Pages/display [CORE\cake\libs\controller\components\acl.php, line
273]
Code | Context

if (empty($aroPath) || empty($acoPath)) {
trigger_error(__("DbAcl::check() - Failed ARO/ACO node lookup in
permissions check. Node references:\nAro: ", true) . print_r($aro,
true) . "\nAco: " . print_r($aco, true), E_USER_WARNING);

$aro = array(
"User" => array(
"id" => "1",
"username" => "root",
"group_id" => "1",
"created" => "2011-02-01 07:19:20",
"modified" => "2011-02-01 07:50:36"
)
)
$aco = "Pages/display"
$action = "*"
$permKeys = array(
"_create",
"_read",
"_update",
"_delete"
)
$aroPath = array(
array(
"Aro" => array()
),
array(
"Aro" => array()
)
)
$acoPath = false

DbAcl::check() - CORE\cake\libs\controller\components\acl.php, line
273
AclComponent::check() - CORE\cake\libs\controller\components\acl.php,
line 92
AuthComponent::isAuthorized() - CORE\cake\libs\controller\components
\auth.php, line 527
AuthComponent::startup() - CORE\cake\libs\controller\components
\auth.php, line 445
Component::triggerCallback() - CORE\cake\libs\controller
\component.php, line 186
Controller::startupProcess() - CORE\cake\libs\controller
\controller.php, line 523
Dispatcher::_invoke() - CORE\cake\dispatcher.php, line 187
Dispatcher::dispatch() - CORE\cake\dispatcher.php, line 171
[main] - APP\webroot\index.php, line 83

Warning (2): Cannot modify header information - headers already sent
by (output started at D:\xampp\htdocs\cakeacl\cake\libs\debugger.php:
673) [CORE\cake\libs\controller\controller.php, line 742]
Code | Context

$status = "Location: http://localhost/cakeacl/users/login"

header - [internal], line ??
Controller::header() - CORE\cake\libs\controller\controller.php, line
742
Controller::redirect() - CORE\cake\libs\controller\controller.php,
line 721
AuthComponent::startup() - CORE\cake\libs\controller\components
\auth.php, line 450
Component::triggerCallback() - CORE\cake\libs\controller
\component.php, line 186
Controller::startupProcess() - CORE\cake\libs\controller
\controller.php, line 523
Dispatcher::_invoke() - CORE\cake\dispatcher.php, line 187
Dispatcher::dispatch() - CORE\cake\dispatcher.php, line 171
[main] - APP\webroot\index.php, line 83

how can i fix it?

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