AclNode::node() - Couldn't find Aro node identified by "Array ( [Aro0.model] => Group [Aro0.foreign_key] => 1 )

when I do Auth with cake , I happened a problem
Warning (512): AclNode::node() - Couldn't find Aro node identified by
"Array
(
[Aro0.model] => Group
[Aro0.foreign_key] => 1
)
" [CORE\cake\libs\model\db_acl.php, line 191]

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