A TimThumb error has occured

The following error(s) occured:

Could not find the internal image you specified.

Query String : src=/wp-content/uploads/2012/07/Un-Sue%C3%B1o-Posible.jpg&w=276&h=135&zc=1&q=100
/wp-content/uploads/2012/07/Un-Sueño-Posible.jpg
TimThumb version : 2.8