A TimThumb error has occured

The following error(s) occured:

Could not find the internal image you specified.

Query String : src=http%3A%2F%2Fwww.mysti2d.net%2Fmysti2dter%2Fwp-content%2Fuploads%2F2012%2F03%2Fvalidation-150x150.jpg&h=150&w=150&zc=1&q=90
TimThumb version : 2.8.10