Error: “This response has already been processed” when submitting a form

To avoid duplicates, there is a mechanism that prevents a form from being posted twice without
a page refresh.

For instance, if you fill out the form, submit it, then hit the browser’s “back” button, change the data and submit again, then you’ll get this error message because the form has already been submitted.

The proper way to submit data again is to refresh the page (using your browser’s “reload” button) after navigating back to the form. Your browser should remember what information was entered, so you don’t have to re-enter all the information. Just change what you need and submit.

If you placed the form on your own site and you get this error message on your first attempt to submit a response, your form is not properly set up. You should make sure that you followed the documented publishing procedure.