Akeeba Ajax Loading Error During Backup

I installed Akeeba Backup to my MexicoBeachExperts.com website.

It did a normal backup just fine. Then, I wanted to set it up to back up to Amazon S3 (especially since my host had a little "hiccup" the other day and it scared me to death). I followed the instructions here: http://www.opensourcesupportdesk.com/blog/80-joomla-component/393-how-to-backup-your-joomla-site-to-the-cloud

But, when I attempt to back up I get this error:

So...what's up?

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