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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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    Getting the following errorThe gadget you added is not validUnsupported

    Asked by buildyourtour on May 14, 2012 at 07:51 PM

    Getting the following error

    The gadget you added is not valid

    Unsupported feature: org.apache.shindig.common.xml.XmlException: Content is not allowed in prolog. At: (1,1)



    This is a re-post of a comment on Adding a Form to Google Sites

    xml content
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    JotForm Support

    Answered by abajan on May 14, 2012 at 08:59 PM

    Well, I've "Googled" the internet for that exact error and 100 results were returned. One of the users (kingmanishrules) at this link suggests that the cause may be too many apps. If you have other apps embedded in your site, try removing some of them and let us know if that helps.