forms in a element

hey i created a form in a element and add the to my home page for some
reason when i submit it it say Invalid form submission and redirect
me to this '/users/register/' i give to the form any idea
here is what i did

<?php
echo $form->create(null, array('url' => '/users/register/' . $this-
>params['url']['url']));

$out = $form->input('username', array('label' => __('Email *',
true)));
$out .= $form->input('email',array('label' => __('confirm Email*',
true)));
$firstName = $form->input('first_name', array('label' => __('First
Name *', true)), array('fieldset' => false));
echo sprintf($html->tags['fieldset'], '', sprintf($html->tags
['legend'], __('Sign Up', true)) . $out);

echo $form->end('submit');
?>

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