Failed to upload an image

Anyone can help me??

I try to upload an image but after i clickn on submit button, i will
get this error.
"Warning (2): Cannot modify header information - headers already sent
by (output started at C:\xampplite\htdocs\myweb\app\controllers
\uploads_controller.php:1) [CORE\cake\libs\controller\controller.php,
line 742]"

//uploads_controller.php

<?php
class UploadsController extends AppController {
var $name = 'Uploads';

function index() {
$screenshotError = $this->data['Upload']['screenshot']
['error'];
$mimeType = trim($this->data['Upload']['screenshot']
['type']);
$this->set('showImage', 0);

if ($screenshotError == 0) {
$screenshot = new File($this->data['Upload']
['screenshot']['tmp_name']);

if (!strstr($mimeType,'image')) {
$this->set('error', 'Unsupported screenshot format
or filesize too large.');
} else {
$fileName = $this->data['Upload']['screenshot']
['name'];
$uploadFolder = 'files/'.$fileName;
move_uploaded_file($this->data['Upload']
['screenshot']['tmp_name'],$uploadFolder);
if(file_exists($uploadFolder)) {
$this->set('image',$fileName);

/* ADD THESE LINES IN YOUR CODE*/
$this->data['Upload']['name'] = 'your name';
$this->data['Upload']['screenshot'] =
$fileName;
$this->data['Upload']['link'] = $fileName;
$this->data['Upload']['link1'] =
$uploadFolder;
$this->data['Upload']['link2'] =
$uploadFolder;
$this->data['Upload']['date_posted'] = time();
$this->Upload->create();
/* ADD THESE LINES IN YOUR CODE*/

$this->Upload->save($this->data);
$this->set('showImage', 1);
$this->redirect('/uploads/index');
}
}

if (!empty($fileName)) {
$this->data['Upload']['screenshot_path'] =
$uploadFolder;
} else {
$this->data['Upload']['screenshot_path'] = '';
}
}
}

function delete($image = null) {
if (!$image) {
$this->set('errMsg', 'sorry invalid link');
} else {
unlink("files/{$image}");
$this->redirect('/uploads/index');
}
}

}

//upload.php

<?php

class Upload extends AppModel{

var $name="Upload";

}

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