Cannot Upload File

Hi there, i have a problem with file field. its suppose to upload image file but there is error.
look at the image attached below.

my drupal 7 version 7.22

ive do some troubleshooting.
1. installed on 7.x-3.18. same error.
2. change default template bartik. same error.
3. tried on drupal 7.17 same error.
4. rename folder "webform" and create manually the new one with the same name. same error