I recently updated to High Sierra, and am now unable to open books (ePubs/PDFs alike) via iBooks. These books are there, I can drag them out to my Desktop or sync them to my iPad, but they do not open in iBooks.

Instead, an alert is displayed with the following text:

The operation couldn’t be completed. (BKAgentServiceErrorDomain error 8.)

A black-HUD-ed spinner appears on the book's icon, spinning indefinitely.

How do I resolve this issue?

  • I am having the same issue, and not sure how to solve it. I refreshed and stopped indexing: sudo mdutil -i off / sudo mdutil -E / Logged out, deauthorised the machine, then logged in and reauthorised: Still same error! This happened since updating to High Sierra. Books are still accessible on iPad – shadi Oct 1 '17 at 20:39
  • There was a recent update to the iBooks app. Did you update? – IconDaemon Oct 13 '17 at 14:56
  • None of my epubs can be opened since high sierra upgrade. The solutions above did not work for me. I hope Apple will remember that iBooks is Apple software, so the issue is clearly with Apple. – Philo Oct 25 '17 at 2:46

This is crazy, but it worked (after everything else failed). I opened:


And clicked on the ePub/PDF files there. iBooks opened them. In my case, I had 1 ePub file, and 1 PDF file. I don't know how or why, but I can confirm that it is an issue related to the Updates folder, because simply deleting that folder caused the problem to resurface.

To all those out there, good luck and godspeed dealing with this infuriating app.

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protected by Community Oct 25 '17 at 4:14

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