passing form inputs into controller

hi guys,... can anyone help please,... I working on group where group owner can send email to all members,... I can't pass form variables into a controller,... I'm getting error: 

Undefined index:  subject

Undefined index:  content

here is the code in  controller: 

            $subject = $this->data['subject'];

            $content = $this->data['content'];

 

and here is my form: 

<?php echo $this->Form->create(null, array('id'=>'FormId', 'url'=> array('controller'=>'group_members', 'action'=>'send/'. $group['Group']['id'])  )); ?> 

<?php  echo $this->Form->input('subject'); ?>

<?php echo $this->Form->input('content', array('rows' => '4')); ?>

<?php echo $this->Form->end('Send'); ?> 

how can I do this,...? 

thanks in advance, 

chris

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