Can get 'crop tool' edit page working

Hi, when I open the crop tool I cannot get this function to work, it was working until yesterday (albeit slightly glitchy).

Now when I try to open the page I can see that it is trying to load the images to crop but they are broken files and don’t show, and instead of the images it says:

“Undefined index: type in [my domain url here]/wp-content/plugins/ttt-crop/template/admin/iframe.inc.php on line 105”

It has this error message for every single photograph.

It does the same thing every time I open it, on every page that I open an image on.

Does anybody know how I can fix this?

My site is http://www.atrium-music.co.uk and I am using Avada theme.

Thanks!

https://wordpress.org/plugins/ttt-crop/