Can't get form to submit

I can’t get this form to submit (at http://jonaslee.com/photo-usage/).

When I click “Send Message,” I see a spinning icon, but nothing happens. (The re-direct doesn’t work, and I don’t receive the message.)

I’ve clicked to update the database, I’ve replaced some of the input fields in the form, and I’ve added a notification email address.

Thanks in advance!
Paul

https://ww.wp.xz.cn/plugins/custom-contact-forms/