This device does not support the audio at this location

Hi!

I Post an audio book and not under any warning, to download the book from the store on each page where an audio says siguiete error:

"This device does not support the audio at this location"

Attached are some screens from the book from iBooks Author. Each audio file is anchored. Also to show that mistake in the iPad screen , change the size of my normal text
Someone has the same problem? * Note iBooks Author and the system of cases are updated to the latest available.