Thread: Error communicating with device
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Old 05-07-2014, 09:36 AM   #14
davidfor
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Posts: 24,905
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Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Quote:
Originally Posted by pipistrelosone View Post

I've a Kobo Aura HD, with a 32 Gb SD card, in wich some thousands of books. And I've seen this message several times when trying to copy in the memory card (I've tried: it also happens if I try to copy to Kobo's maim memory) new books. I don't know why. If you look to the details of the error message, I can see the title of a book, and it seems to be this book who produces the error when Calibre tries to copy to the Kobo device.

After some trials, I've found that the following procedure corrects the error:
  • Convert the book from original format (im my case, always ePub) to another format (in general, I convert ot MOBI format)
  • Delete the original ePub file
  • Convert again the book, from MOBI to ePub
  • Delete the MOBI file (you can keep all the two formats, if you want)
  • Send the book to the Kobo device: no error is detected any more

For me, the real annoying thing is that, when I'm copying new books to the Kobo device (some times, several hundreds), if a book produces this error, the all task is cancelled (that is, if the book is at the last of the list, you've lost a lot of time transferring books that, finally, will not appear in the device).

I suppose this is a known problem for all Kobo's users (well, I suppose Kobo has not developped a fully different OS for every of hes devices). So, my questions to Calibre community:
  • Could be it possible to open a "ticket" to Calibre's developpers, to check this problem, and try to do an utility allowing the checking of a list of files before trying to copy them in the device
  • As it seems this is could be a Kobo's specific problem, could the Calibre community address this problem to Kobo company? (I have the feeling that, if I report directly this problem to Kobo, Kobo will ignore me)
All this makes me think you are using the KoboTouchExtended driver. This does on-the-fly conversion to kepub. If there are problems in the source epub, it will fail. That would give an error like you describe. And a conversion to mobi and back would probably fix the problems. Even a epub to epub conversion would probably fix it.

If I am right about the driver, you can report the failing books to the author of the driver. See https://www.mobileread.com/forums/sho...d.php?t=211135 for details.

You can also do a conversion and keep the kepub in the calibre library. For this, you need the KePub Output Plugin. Then you send the kepub to the device. I don't use this enough to know if this would solve the problem you are seeing or not.

If I am wrong about the driver you are using, then I need more details about the error. From the details I can see where the error is happening and hopefully be able to fix it.
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