I found the solution :D,
just update the required fields.
$this->_refreshAuth('username',$this->data['User']['username']);
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OK, I found the problem I was using this function some how this
function disables errors. please help..
function _refreshAuth($field = '', $value = '') {
if (!empty($field) && !empty($value)) {
$this->Session->write($this->Auth->sessionKey .'.'.
$field,
Form validation error doesn't show! CPHP 1.3
I have a user model and in my user model i have
User Model
array(
'usernameRule' => array(
'rule' => 'alphaNumeric',