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 apologize for any inconvenience caused.
But can you please provide us more clarity on what the issue was.
To clone your own form/s you can follow this user guide
The user guide you previously was referring to was cloning from the URL (could be another user's form)
I just cloned your jotform http://www.jotform.us/form/50205806969158
and it was working fine
It is highly possible you could NOT clone another user's form because they have locked the form and disallowed cloning. This is part of form security feature.
Hope this help. Let us know if you need further assistance.
I've occasionally encountered this error while trying to clone forms and the cause each time was that I wasn't logged in to my JotForm account. It's possible this is the cause on your end too.