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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The code provided below should work by replacing the Direct URL with your JotForm link.
<a target="_blank" href="YOUR DIRECT URL TO THE FORM" >Your text related to form here</a>
I am not sure though, but with the error message provided by you, it seems that that there is a mandatory field left blank. It would be helpful for us if you can provide us with the screenshot of the error so that we can provide you necessary assistance.