When I open some book it is show me an alert message "This book can't be opened" and then all books disappear.

  • Welcome to Ask Different. Could you take a stab at searching for some article on how to do basic troubleshooting on OS X and edit what step you need help with into the question. This is a little too vague/broad for people to do much but guess what you have tried or even what your skill level is. – bmike Nov 6 '15 at 0:27
  • Also, this janky set of steps might help if you don't have a backup and can't wait for AppleCare to get you a better answer... discussions.apple.com/message/29021775#29021775 – bmike Nov 6 '15 at 1:03

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