A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = ''/home/bluecoas1/domains/allaboutlighting.org/public_html/wp-content/plugins/photoblocks-grid-gallery/public/cache/timthumbnAaKDF

Query String : zc=4&max=1600&src=http://allaboutlighting.org/wp-content/uploads/2018/07/Outdoor-Lighting-Ideas-Design-No.-7602S.jpg
TimThumb version : PhotoBlocks