error in loading book

I was recently trying to open a book on my iPad that I am reading on my computer.  Several times it failed to load reporting an error in loading the book.  (Of course they never tell you what the error is).  I tried loading other books and did not seem to get an error.  

The book I'm trying to load is Beyond the Bounds by John Piper, Justin Taylor and Paul Kjoss Helseth.  I'd appreciate any help I could get as it would be beneficial for a class I'm teaching to be able to prepare on the go.

Thanks!

John