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.
This error is related with your web server, so if you are not the web administrator of your site then you need to contact your web admin to check your server error log on what seems to be causing this problem.
You can read through this article on possible cause of this error http://askleo.com/whats_an_internal_server_error_and_how_do_i_fix_it/.