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.
Unfortunately, we don't have Phone Support available, but we will do our best to help you hare on forum.
If I understood you correctly you are getting mentioned error message when you submit your form.
I have tested your embedded form and I was able to replicate mentioned issue.
This is happening because of Mobile Responsive widget, which is set to be required. To resolve your issue un-require that field inside of Form Builder.
Hope this will help. Let us know if you need further assistance.