A TimThumb error has occured

The following error(s) occured:

The remote file is not a valid image. Mimetype = ''/home/webpages/lima-city/onemillionplaces/omp/wp-content/plugins/justified-image-grid/cache/timthumbgIKN3m

Query String : src=https%3A%2F%2Fone-million-places.com%2Fwp-content%2Fuploads%2F2018%2F04%2Freiseberichte%2Fheiraten-am-strand-robinson-16.jpg&h=603&w=905&q=35&f=.jpg
TimThumb version : JIG