How to get Cake to log error?

[Daniel]

I've got some exception code as follows:
 
try {
  if ($this->hashCaptcha(strtolower($this->request->data['User']['code'])) 
!=
  $this->Session->read('user_captcha_code'))
    throw new Exception('Incorrect captcha code.  Please, try again!');
...
}
catch(Exception $e) {
  $this->Session->setFlash(__($e->getMessage()));
}
 
How to get Cake to log the error aswell as display the flash message?
I tried:
$this->cakeError('AddUserError', array('message' => $e->getMessage()));
... but that just caused "Internal Error" to be displayed.
 
Thanks.

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