Have you tested this out on a local server? I'm wondering if your live server is not configured properly to allow for file uploading in php. Do you have a connection to your db defined and have the connection file uploaded to your server? I believe that the advanced file management features require the use of a db, if it is not available you will not be able to upload files through the advanced file manager. Please post back with this info and any other details that you can come up with so we can help determine what is going wrong.