Permission error
From MoodleDocs
You do not have permission to upload this file, for the following reason:
Note: You are currently viewing documentation for Moodle 2.5. Up-to-date documentation for the latest stable version of Moodle may be available here: Upload.
You do not have permission to upload this file, for the following reason:
The action you have requested is limited to users in the group: Administrators.