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Old 06-29-2021, 06:36 PM   #1
esommer7
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Question E-book viewer keeps throwing an Unknown Error
I'm trying to read a large EPUB textbook. When the e-book viewer tries to load a new section, such as when I click on a link in the TOC, it loads for a moment and then gives this error:
calibre, version 5.22.1
ERROR: Unhandled error: Unknown error

Traceback (most recent call last):
at Number.onload (userscript:viewer.js:17472:21)
at IframeBoss.content_loaded (userscript:viewer.js:26979:22)
at IframeBoss.apply_highlights_on_load (userscript:viewer.js:27808:21)
at range_from_cfi (userscript:viewer.js:14511:21)
at decode (userscript:viewer.js:13821:25)
at node_for_path_step (userscript:viewer.js:13761:20)
at node_at_index (userscript:viewer.js:13723:48)
TypeError: Cannot read property 'calibreRangeWrapper' of undefined
What do I do?
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Old 06-29-2021, 06:47 PM   #2
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Here is a screencapture of the problem.
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Old 06-29-2021, 07:46 PM   #3
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Given that, AFAIK, calibre's e-book viewer is Chromium based, I suspect it is being fed an undefined object when reading a property or calling a method. In your case, CalibreRangeWrapper is the culprit.

I could be wrong since I only know enough about JavaScript to be dangerous.
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Old 06-29-2021, 10:12 PM   #4
kovidgoyal
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That looks like a bug in chromium, there's an element node in the DOM without the dataset property. This should work around it https://github.com/kovidgoyal/calibr...96e202ee5beca2
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Old 06-29-2021, 10:23 PM   #5
esommer7
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thank you so much for your help!

I'm relatively new to both coding and calibre. How do I use that workaround?
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Old 06-29-2021, 11:03 PM   #6
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It will be in the next release, you just need to wait.
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Old 06-30-2021, 06:52 AM   #7
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Okay, thank you!
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