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Ebook in EPUB format fails to load / displays errors #450
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Reference: github-starred/cs249r_book#450
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Originally created by @bluebaer7 on GitHub (Nov 1, 2025).
Originally assigned to: @profvjreddi on GitHub.
I tested the epub format on Apple Books & Tolino (German Speciality.. ).
Apple Books loads the epub but has errors and dsiplays only 664 pages.
On Tolino the upload to the ebook sync server fails / does not display.
Both plattfroms work with the PDF.
However on the tolino reader the PDF display is unconfortable.
@profvjreddi commented on GitHub (Nov 1, 2025):
Hi @bluebaer7, Thanks for letting me know! All previous builds were working, and I just checked and realized that something broke when I pushed things up on October 20th. I will double-check.
@profvjreddi commented on GitHub (Nov 2, 2025):
@bluebaer7 just wanted to let you know that I've pushed a new release of the book. Please download epub and let me know if it works for you. Or, you can simply visit the main link book, which also includes the updated links.
Thanks so much for letting me know. I didn't realize it was broken so badly because of other fixes I had pushed.
@bluebaer7 commented on GitHub (Nov 3, 2025):
Thx for the fix. The upload to the reader now works. However there still seems to be an error from page 50 - 60 when loading it to Apple Books. There seems to be hook in the reader too, when changing pages around that number.
@profvjreddi commented on GitHub (Nov 3, 2025):
Thanks for the feedback. I made a few more improvements and pushed it. It will be available in a few hours once all the build testes pass.
@bluebaer7 commented on GitHub (Nov 3, 2025):
Now the pages under Apple book stays completely blank… Tolino ebook reader does not allow upload to cloud and partially show content.
@profvjreddi commented on GitHub (Nov 4, 2025):
Hi @bluebaer7, are you sure you checked epub? I only just published a new release, so it couldn't have been live for more than 5 hours.
Could you please check again. I used Apple and i stepped through all the pages.
@bluebaer7 commented on GitHub (Nov 4, 2025):
I checked again, with a freshly loaded version, same effect. The Tolino app shows the book but doesn’t allow upload.
@profvjreddi commented on GitHub (Nov 6, 2025):
Hi @bluebaer7 -- thanks for your patience. I'll take a look at it over this weekend. I've been busy with classes, administrative work at school, and working on TinyTorch. Please give me a few more days, and I will figure this out as it seems to be something in the EPUB that might be breaking across readers, cause I do test it on Apple stuff.
@bluebaer7 commented on GitHub (Nov 7, 2025):
Hello @profvjreddi, thank’s for the update. Give me a heads-up if you have fix. I‘ll run it through my readers (apple & tolino). At the moment I‘m fine with the pdf.
@profvjreddi commented on GitHub (Dec 10, 2025):
I didn't get back to you, but I did push some updates!
@profvjreddi commented on GitHub (Dec 10, 2025):
Please see and let me know if you have any issues. For some reason Clearview reader shows an error at the top though it renders the whole book. Could you please let m eknow?
@bluebaer7 commented on GitHub (Dec 14, 2025):
Hello, thanks for the update. The epub now works fine on the ipad on apple books and partliy in the tolino app see below.
The sync with the upload to the tolino server and the display on the tolino reader is ok / the download to the reader is very slow.
However there is a display error in the tolino reader on the Ipad 178/180 (picture 3) displayed as pages 86 / 87 on the apple books.
@profvjreddi commented on GitHub (Dec 17, 2025):
Thanks for sharing this. Take a look into it. There must be something about possibly having too many tables close to each other.