Cakephp user privileges ACL

I have an ongoing project in cakephp . 

I tried ACL using cakephp cookbook using the Posts example,but on add,edit & delete, the following error occurred-

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

Please reply as soon as possible .

Thanks.

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