Data Validation error message fails on $this->redirect

I've had no luck locating any resource online for resolving my issue
(which I feel is fairly easy), and thought I'd post it on here to see
if anyone has input.

I'm trying to use the built-in data validation for submitting a form.
The originating action, say, "manage_posts", displays the form to the
user and lets them modify data for that post. When they submit, it
sends the data to "activate_post".

In the "activate_post" action, I call the if($this->Datavalue->set
($this->data) && $this->Datavalue->validates) function to test the
data, and if that test fails I redirect back to "manage_posts"...

The actual validation process seems to be functioning. It accepts
valid data and redirects on invalid data. However, when it redirects
to the previous action, it doesn't actually display the error message
for that HTML element

In the original form, I am in fact calling $this->Form->error
($datavalue, $error_msg) after generating the HTML element with $this-
>Form->input().

Likewise, I have other actions throughout my application that use data
validation and work correctly. However, they don't redirect to another
action on failing validation. An example would be an action to
"add_posts"... When the user submits data, it submits to itself,
tests, and upon validation renders the same action/view.

It seems that I'm only experiencing these problems when I redirect on
the failure of a data validation. Any thoughts?
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