A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = ''/home/bwskyerc/domains/bwskyer.com/public_html/wp-content/themes/MyDream-master/cache/timthumbYgbjjn

Query String : src=https://bwskyer.com/wp-content/uploads/2019/03/customizecode.jpg
TimThumb version : 2.8.14