that's a problem with all built-in content. Auran makes the game think that most built-in content is error-free, when, if edited or opened for edit, will, you could say awakens, the errors. have you edited the cabin in any way or opened it for edit? that would produce the errors because the game thinks they aren't faulty, but, like I said, the errors will activate when edited or opened for edit.
and btw, to post screenshots, you need to first host them at a site (I use photobucket). then right-click on the picture once uploaded and click <Copy>. then come here and make a post, then click on <Insert Image> and <Paste> the URL into the box. make sure to do a preview of your post to make sure you did it correctly.