CakePHP 2: Indirect modification of overloaded property ... has no effect

Continuing to work through migrating to Cake2, I'm hitting this error.
The code would be something like:

$this->data['User']['password'] = AuthComponent::password($this-
>data['User']['password']);

The error:

Indirect modification of overloaded property UsersController::$data
has no effect

In another case, I try to unset a value in $this->data and get the
same error.

Can anyone help with this?

thanks

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