An unknown response 400

[mtsgonyaw]

Whenever I "submit" to the cart I'm getting the following message in my browser...

An unknown response 400: :text/html; charset=utf-8: : was received while processing an ajax call. The action you requested could not be completed.

It does continue on but that doesn't work well for a real customer placing an order. They aren't going to over look that. Ideas on what I need to do to fix it?

[balihr]

Have you tried this?

[mtsgonyaw]

Thank you! That works.