TimThumb Error

The following error(s) occurred:

• You may not fetch images from that site. To enable this site in timthumb, you can either add it to $ALLOWED_SITES and set ALLOW_EXTERNAL=true. Or you can set ALLOW_ALL_EXTERNAL_SITES=true, depending on your security needs.

Query String: src=http%3A%2F%2Ffile.mihanblog.com%2F%2Fpublic%2Fuser_data%2Fuser_files%2F571%2F1711715%2Fchignon%2Fchignon1.jpg&w=90&h=64&zc=1
TimThumb version: 2.8.14
Instruction: Thumbnails don't work — what to do? (registration required)