CakePHP download function returns 'empty' file

Help me, please, to resolve my small problem! I have next function in my PostsController:

public function download() {      if (isset($this->request->query['file']) && is_file(POST_ATTACH_PATH . $this->request->query['file'])) {          $file = $this->request->query['file'];          $output_name = 'up_free_' . rand();            $this->response->file(POST_ATTACH_PATH . $file, array(              'download' => true, 'name' => $output_name          ));            return $this->response;      } else {          $this->redirect(array('controller' => 'posts', 'action' => 'index'));      }  }

The problem is that my download function returns me 'empty' file! For example, if I have attached an image to the post and click the download button, my image downloads! But downloaded file is 'empty', I can't open it and if it is .jpg file it has the size of 132 KB.
Thank You!

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