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.
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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 cloned your form to test it, setup the esign widget with my test account and everything appeared to work properly. After entering my email address in the widget, I was presented with the pop-up for the signature process:
However, when I test your copy, I do indeed get the "Something's Wrong" error.
Try replacing the widget with a new copy and authenticating once again. The widget should be working with a properly authenticated account.
Here is my test form so you can see it working:
If it still does not work after replacing it with a new copy, let us know and we will be happy to have another look.