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[GH-ISSUE #1148] E999 error when send epub to Kindle #4328
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Originally created by @s3rg3ysh on GitHub (Jan 28, 2026).
Original GitHub issue: https://github.com/harvard-edge/cs249r_book/issues/1148
I'm getting E999 error when trying to sent epub file to my Kindle via Amazon's Send to Kindle page
@kent-williams commented on GitHub (Jan 28, 2026):
I just tried and experienced the same thing
@profvjreddi commented on GitHub (Jan 28, 2026):
Thanks @kent-williams and @s3rg3ysh for reporting!
Quick question — is this the first time you're trying to send it to Kindle, or has it worked for you before?
I myself just use PDF, so honestly, the EPUB isn't something I have thoroughly debugged or made perfect. But I know it works on other readers for sure. I just haven't heard anyone mention Kindle before.
@s3rg3ysh commented on GitHub (Jan 28, 2026):
It's first time to me, and this is only epub file (latest version) for this book I tried to upload via Send to Kindle page. I experienced the same error with other books as well, this for example https://github.com/victordibia/designing-multiagent-systems/issues/8. Unfortunately I cannot upload epub to my Kindle directly via USB, that only works for mobi files. Thanks
@profvjreddi commented on GitHub (Jan 28, 2026):
Ah, interesting — so it's not specific to our book. If you're hitting E999 on multiple EPUBs, you might have an older Kindle model? I should really get a Kindle, maybe I can get my kid one and tell her it's to debug our book 😅
Use Calibre (free) to convert the EPUB to MOBI yourself — would that work? When I get a chance I will try to play around with the Kindle side, but it's the start of the semester so things are hectic here :) Appreciate your patience!
@bl00dny commented on GitHub (Jan 28, 2026):
I have latest Kindle Scribe device and about hundred other epub (even published in 2026) books which I have uploaded with no issues. It's still me (s3rg3ysh), just replied from another GH account
@panth commented on GitHub (Feb 17, 2026):
I am also facing the same issue and yes other books are going in fine to my kindle. I like Kindle because doesnt play on the eyes and gives distraction free reading experience.. Lets see :-(
@profvjreddi commented on GitHub (Feb 17, 2026):
Another user has reported the same issue in #1174 (now closed as a duplicate), indicating that this is affecting multiple Kindle users.
I acknowledge that this is a real issue — the EPUB I generate is not passing Kindle's validation. Based on @bl00dny's feedback (regarding Kindle Scribe), it appears that other EPUBs work fine, so the problem lies with what I am rendering and not with the device. The root cause is likely that our Quarto-generated EPUB contains elements that stricter validators reject. I have to figure this out. We have already encountered this issue with ClearView in #1052, including double hyphens in XML comments, CSS variables, and other factors. Still sifting through this in the midst of all the semester craziness here :) Kindle's "Send to Kindle" service conducts its own validation and is rejecting the file as a result. So if folks know how I can test this that would be helpful. Or if someone can help that'd be even more awesome!
@s3rg3ysh commented on GitHub (Feb 24, 2026):
As option you can download Calibre E-Book Management, open epub in Calibre E-book Editor and use Check book tool by clicking on Bug icon or selecting Tools -> Check book. This will give you list of errors with explanation and link to place in a problem file. Every time you fix the problem re-run Book check that you can see more errors (if any). Hope that will help you to identify potential type of issues and address them in automated manner.
@profvjreddi commented on GitHub (Feb 24, 2026):
Oh this is super helpful! Thanks a bunch @s3rg3ysh -- I've been deep in making some big edits and working on vol2 so will circle back to this soon.
@bluegardenink commented on GitHub (Apr 15, 2026):
faced the same with Kindle. used calibre to convert the web EPUB to EPUB. Working now. The page jumping is slow but eventually becomes smooth for page to page switch.