What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I've just submitted the form without any issues. I see that you've removed Terms & Conditions widget from your form.
Were you experiencing this issue before removing the widget Terms & Conditions? I've cloned your form and added the widget to test and I was able to submit the form without any errors.
Could you try clearing the browser cache by following the steps provided in http://www.wikihow.com/Clear-Your-Browser%27s-Cache?
Also, please try adding the widget and let us know if you are able to submit the form normally.
Please get back to us with results so that we'll look into this issue further.