A TimThumb error has occured

The following error(s) occured:

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 : w=370px&h=250px&src=http://stilmodmedia.ro/client/monalisa/wp-content/uploads/2013/08/esal1.jpg
TimThumb version : 2.8.10