File upload class

[eluser]debasishdebs[/eluser]
I am using latest version of CI on both linux and windows machine.
When I try file uploading class, as part of debugging , it says:
“The upload path does not appear to be valid.”
I tried to make $config[‘upload_path’] a link and the dir exists.
Even i changed the permission of upload path to 777 from terminal still same problem.

Help?

I am making CMS for the group m working..

My upload function in controller.(returns : bool(false)

Code:

function do_upload()

{

  $config['upload_path'] = '../../../images';

  realpath($config['upload_path']);

         var_dump(is_dir($config['upload_path']));

   if(!is_writable($config['upload_path']))

        echo "You cannot upload to the specified directory, please CHMOD it to 777.";

  $config['allowed_types'] = 'gif|jpg|png';

  $config['max_size'] = '0';

  $config['max_width']  = '0';

  $config['max_height']  = '0';

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

  $var = $this->upload->initialize($config);

  echo "<a >".$config['upload_path']."</a>";

  echo "Helllo";

  if ( ! $this->upload->do_upload())

  {

  

   $error = array('error' => $this->upload->display_errors());



   $this->load->view('upload_form', $error);

  }

  else

  {

   $data = array('upload_data' => $this->upload->data());



   $this->load->view('upload_success', $data);

  }

}