Newsletter sign up form fails to give user feedback on missing required fields

1. Go to http://www.curriki.org/welcome/about-curriki/curriki-newsletter-sign-up/
2. Fill in a few fields but not all.
3. Submit the form.

Bug
You get this url http://www.icontact.com/icontact-error?Your+email+address+must+be+provided

With the message:
We've experienced an error with your request.
It looks like we discovered an error in your new request. Please go back to try again. Double check the information you have entered.

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I thought it use to give feedback on what was missing.

I checked Beta and had the same results.