My brother is trying to download the in-app dungeons, but he gets an error when he tries to download. It gets to the point where it says "Buy" for £1.19, but on the next screen it pops up and says:

"You cannot purchase this. You must purchase the app that this item is for before you can purchase the item."

Any ideas? He has tried this three times and gets the same error every time. At this point he is just hoping it hasn't charged him for content three times when he hasn't received any of it.