Getting the following errorThe gadget you added is not validUnsupported

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)

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.