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 apologizes for this issue you're having. It happens because of the following reasons;
1) Login Timeout.
2) If your IP changed instantly.
These are only reasons, why you getting this error. I have cloned your form for this particular thread, and tested on my end, page loads properly.
I suggest you to reload the page, when you see this page. Hope this information helps. Do get back to us, if you need further assistance in any way. We would be happy to assist you.