E_PACK_ERROR message when uploading ePub files

  • Does this happen to just one particular book? Have you tried uploading another and still get this error?

  • If you're uploading a PDF file, please ensure it has no encryption. Our system will automatically encrypt your document with military-grade algorithms immediately following upload.

  • Adobe's DRM scheme is stringent on the formatting of ePub files. Even documents that go through epub check can get stuck during the encryption phase though that is a sporadic case. We'll dig through our server logs to see if we can produce some actionable items for you to get these up and to run.

  • In the meantime, please run the file through the epub check tool at https://code.google.com/p/epubcheck/. Its output could also help identify the problem.