those are warnings... i think, but they should not give you problems... well just that each time you see the page you will see it.
here is a quick solution and the one im using:
http://www.mysidiaadoptables.com/for...9&postcount=13 is not the best one, because you will no longer see errors in the pages, just a blank page, and will have trouble trying to find what did you wrong at editing that page... so i recommend to "fix it" once you have finished making the edit you want to your site. Or you can always post the problem in the Bug Tracker:
http://www.mysidiaadoptables.com/for...hp?projectid=1 and see if HoF can fix it in a more permanent and correct way