What I'm saying is that it seems a lot more likely to me that the caretaker of the site screwed up. It's possible somebody found an exploit and was able to upload a file that the site is trying to parse in some way and choking on, but I don't think there's much evidence of that yet.I really have no clue what's going on. All I can tell you is that a CSS asset is probably a .css file, a cascading style sheet that's used to format websites. Why it's choking on that I can't say.