Multiple file upload library

[eluser]Unknown[/eluser]
Hi.. Thank you for making the extended library for uploading files.. I tried to use your extended library, but unfortunately I got an error.. I wonder if you could help me resolve this.. Thanks a bunch..

(This is my error message)
A PHP Error was encountered

Severity: Notice

Message: Uninitialized string offset: -1

Filename: libraries/MY_Upload.php

Line Number: 85

(And this is what I wrote on my controller)

Code:

$config['upload_path'] = './image/upload/';
$config['allowed_types'] = "jpg|png";
$config['max_size'] = '100000';
$config['max_width']  = '6000';
$config['max_height']  = '6000';

$this->load->library('upload', $config);
$uploaded = $this->upload->up(FALSE);
  
foreach($uploaded['success'] as $file){
   echo $file['file_name'];
}

EDIT :
My bad.. The upload path should be like './image/upload' instead of './image/upload/'.. Thx anyway..