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How to display error messages in CodeIgniter

In my controller, I put this code to check if the recycle bin is empty:

if (!$this->cart->contents()){
    $this->session->set_flashdata('message', 'Your cart is empty!');
}

$this->data['message'] = $this->session->flashdata('message');

$this->load->view('templates/header', $this->data);
$this->load->view('bookings', $this->data);
$this->load->view('templates/footer');

In my reservation view, I set this code to display a message:

<div id="infoMessage"><?php echo $message;?></div>

But on the first page, load the message "Your basket is empty!" not displayed. However, it will be displayed when I press the F5 key or refresh the browser.

I already read a codeigniter manual that says: "CodeIgniter supports flashdata or session data that will only be available for the next server request and then automatically cleared."

However, I do not know where to install this message so that it is available on the "next requrest server".

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:

if (!$this->cart->contents())
{
    $this->data['message'] = 'Your cart is empty!';
}

$this->load->view('templates/header', $this->data);
$this->load->view('bookings', $this->data);
$this->load->view('templates/footer');

:

<div id="infoMessage"><?php echo $message;?></div>

flashdata​​h2 >

, flashdata, :

:

if (!$this->cart->contents())
{
    $this->session->set_flashdata('message', 'Your cart is empty!');
}

redirect('/your_page');

:

 <div id="infoMessage"><?php echo $this->session->flashdata('message');?></div>

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$this->session->keep_flashdata('message'); .

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