Variables are not passing in view from my controller

The Controller:

PHP Code:

class Upload extends CI_Controller
{
    function __construct()
    {
        parent::__construct();
        $this->load->helper(array('form', 'url'));
    }

        public function do_upload()
        {
        $config['upload_path'] = './assets/images/uploads/promo/';
        $config['allowed_types'] = 'jpg|png';
        $config['max_size']    = '2000';
        $config['max_width']  = '3000';
        $config['max_height']  = '1768';

        $this->load->library('upload', $config);

        if ( !$this->upload->do_upload())
        {
            $error = array('error' => $this->upload->display_errors());
            $data['error'] = $error;
            $data['data'] = "";    
            $this->load->view('admin/upload_promo', $data);

        }
        else
        {
            $data['data'] = array('upload_data' => $this->upload->data());
            $data['error'] = "";
            $this->load->view('admin/upload_promo', $data);
        }
        }
} 


The View:

PHP Code:

<?php 
if($data != ""){echo "Image Uploaded Sucessfuly!";}
if($error != ""){echo $error;}

 ?>

PHP Code:

<?php echo form_open_multipart('upload/do_upload');?>

Code:

<input type="file" name="userfile" size="20" />

<br /><br />

<input type="submit" value="upload" />

</form>

The Error:

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: data

Filename: core/Loader.php(830) : eval()'d code

Line Number: 8

---

What is the Problem??