If I understand you correctly, you are trying to embed the thumbnail plugin into Kprotect. I may be wrong but I don't think it can be protected since it draws from an external XML.
See this link: http://www.krpano.com/forum/wbb/inde…d&threadID=1549
IF you are referring to something else, as you are getting a different error than what was stated in the link, let us know.