That page usually means the story has been deleted/no longer exists but I can still see it so I'm at a bit of a loss. I will pass on your issue to the tech people. Which chapter were you trying to view? Can you see the contents page but not the chapter, or is the whole thing just missing? And if you follow the link from her author page rather than the direct link to the story, does it make any difference?
I've just noticed the story is missing first chapter which could partially explain the reason it is acting strangely.
EDIT: Ok, the missing first chapter is intentional, and should be back again in a couple of days. Hopefully once the new first chapter has been validated you'll be able to see it, but if not we'll look into it further.