A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = ''/home/pzrmnfz84c5o/public_html/wp-content/plugins/photoblocks-grid-gallery-premium/public/cache/timthumb55Swl3

Query String : zc=4&max=1600&src=https://themademan.org/wp-content/uploads/2019/03/46146894792_cb1651e2e8_o-684x1024.jpg
TimThumb version : PhotoBlocks