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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I did test your form which is embedded in your webpage and it does display the following error message after the form is submitted. Please check the screenshot below:
Please note that the error message which is displayed is not generated by JotForm. The submission was captured successfully in your form's submission page. Please check the screenshot below:
The issue seems to be related to the custom thank you page URL you have added in form. When the form is submitted, users are redirected to custom thank you page which is showing this error message. Please check the screenshot below:
I would suggest you to please check your own custom thank you page and debug the issue there.