error for send email

i want send email,but i have this error:

Warning (2): getmypid() has been disabled for security reasons [CORE/
cake/libs/string.php, line 89]

where is my problem

my controller:

if (!empty($this->data)) {
$this->Email->from = 'example <info@example.com>';
$this->Email->to = 'example <example@example.com>';
$this->Email->subject = '>'. $this->data['Pages']['name'].'_'.$this-
>data['Pages']['email'];
$this->Email->send($this->data['Pages']['message']);
$this->Session->setFlash(__('Your message send!', true));

}

my view:

<?php echo $this->Form->create('Pages'); ?>
Name:<?php echo $this->Form->input('name', array('label'
=> '')); ?>
Email:<?php echo $this->Form->input('email', array('label'
=> '')); ?>
Message:<?php echo $this->Form->textarea('message'); ?>
<?php echo $this->Form->end('Send'); ?>
<?php echo $this->Session->flash(); ?>

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