A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = ''E:\Website\Dvbcn\wp-content\themes\skin\cache\timB92A.tmp

Query String : src=http://vod.dvbcn.com/e42b6de236904f03905e2c9a627d5928/covers/940688c146e747b4bc6a3b828c1bd343-00001.jpg&h=428&w=760&zc=1
TimThumb version : 2.8.13