ACL is not working for groups

I want to utilise the concept of groups in ACL. I am very new to
cakephp, and messed up with ACL. My database tables are as follows:
CREATE TABLE IF NOT EXISTS `gcfa_groups` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
);

CREATE TABLE IF NOT EXISTS `gcfa_users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`password` varchar(50) NOT NULL,
`active` tinyint(4) NOT NULL DEFAULT '1',
`email` varchar(255) DEFAULT NULL,
`group_id` int(11) NOT NULL,
`name` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
);

id is being used as username.

My model files are as follows:
class User extends AppModel {
var $name = 'User';

var $hasMany = array('UserBank', 'UserNominee', 'Payment');
var $belongsTo = array(
'Group' => array('className' => 'Group',
'foreignKey' => 'group_id'
)
);
public $actsAs = array('Acl' => array('type' => 'requester'));

public function parentNode() {
if (!$this->id && empty($this->data)) {
return null;
}
$data = $this->data;
if (empty($this->data) || empty($this->data['User']['group_id']))
{
$data = $this->read();
}

if (!$data['User']['group_id']) {
return null;
} else {
$this->Group->id = $data['User']['group_id'];
$groupNode = $this->Group->node();
return array('Group' => array('id' => $groupNode[0]['Aro']
['foreign_key']));
}
}

public function bindNode($object) {
if (!empty($object[$this->alias]['group_id'])) {
return array('model' => 'Group', 'foreign_key' => $object[$this-
>alias]['group_id']);
}
}

function isAuthorized($user, $controller, $action) {
return true;
}

}

class Group extends AppModel {
public $displayField = 'name';
var $hasMany = array('User');

public $actsAs = array('Acl' => array('requester'));

public function parentNode() {
return null;
}
}

I just baked the controller and view files for these models using
shell. I have setup my ACL as follows:
id parent_id model foreign_key alias lft rght
1 NULL Group 1 SuperUser 1 2
2 NULL Group 2 Administrator 3 4
3 NULL Group 3 Manager 5 6
4 NULL Group 4 Author 7 8

Whenever I am going to edit any user it is giving me error :
Warning (512): AclNode::node() - Couldn't find Aro node identified by
"Array
(
[Aro0.model] => User
[Aro0.foreign_key] => 2
)
" [CORE/Cake/Model/AclNode.php, line 179]

Do I need to make separate entry of every user in aros table? If yes,
then what is the use of groups in this case? If I want to bypass this
creation of new entry in acos table, is it possible? I think if I am
able to override AclBehaviour::afterSave method then I can do that.
I dont want to create a separate entry for every user in the ACL.

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