Why i have this message?

Hi every one,
Since i downloaded OS XMavericks (maybe there is no link!), i receive that message when I'm using iBooksAuthor, Pages or Keynote.
Why?
Tx
Steeve

What you are not identifying is--- what changed the file.  The solution to your problem is knowing that and dealing with it.
I suggest  you  dupplicate or copy the book file and if the error message is still shoing - revert  and  examine what was removed.
Restarting your computer or  whatever happens in Keynote of etc,   will not help.  The error  meassage make it clear.. you have added somthing to the  book which  has corrupted the  structure or you have been opening  the iBA/ibooks file as a zip to rummage  with the code pages.
You  need to  remember and investigate what action  you were making  BEFORE  the file  generated this message.

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