Error with Justified Image Grid

I am getting an error (see link below for screenshot) on any pages that use the Justified Image Grid (http://justifiedgrid.com). This error appears for every image that should be there so if there are 10 images there are 10 of these errors. Hope you can help.

http://grab.by/AhkG

Thanks,

Paul

https://ww.wp.xz.cn/plugins/google-analytics-for-wordpress/