The error that you’re facing is that http://eternalvale.infinityfreeapp.com/dnd/dmscreen/js/data_environments.js does not exist.
I think you should see you other topic: Why wont this work? - #5 by Greenreader9
It’s not a CORS issue. You get a CORS error on our 404 page. But the thing you need to worry about is not the CORS error, but the fact that your website is trying to load our 404 page.
If you add the missing file, your website won’t redirect to the 404 error and the CORS error will disappear.