Receiving error when submitting form without required fields.

We are experiencing difficulty when trying to submit our form even though we have all required fields are filled out. It is not happening for everyone. Please see attached error screenshot. 

This is a duplicate thread to https://www.jotform.com/answers/1047408 which is just addressed. So, we are marking this thread as answered. If you have any questions with this issue, we request you to follow-up on the other thread.

Thank you!