Error: Failed to gather data

Karellen · 11-12-2022, 01:48 AM

Hello,

When running the Reports tool, I occasionally encounter the "Error: Failed to gather data" error as shown in the image.

It is not a recent error, and has been around even in QT5 releases.
It affects EPUB v3.0 only
I am using Windows 10

To replicate...
Open the "Edit Table of Contents" tool
Delete all the entries
Run "Generate ToC from major headings"
I normally add a couple of extra items, like Cover page and Title page
OK.

When you run the Report tool, the error occurs.

To fix...
Delete the nav.xhtml and toc.ncx files
Recreate the table of contents.
This seems to fix whatever the problem is.

When I run "Check Book" or "EpubCheck" before the fix, no errors are flagged.

Why do I delete the existing TOC? Because I have recreated the chapters and most likely changed them from a <p> tag to the usual <h> tags. Or I have added additional pages like Character Summary.

kovidgoyal · 11-12-2022, 02:49 AM

https://github.com/kovidgoyal/calibr...d551b3b521831c

Karellen · 11-12-2022, 03:35 AM

Thank you very much @kovidgoyal

11-12-2022, 01:48 AM	#1
Karellen Wizard Posts: 1,611 Karma: 9500498 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Error: Failed to gather data Hello, When running the Reports tool, I occasionally encounter the "Error: Failed to gather data" error as shown in the image. It is not a recent error, and has been around even in QT5 releases. It affects EPUB v3.0 only I am using Windows 10 To replicate... Open the "Edit Table of Contents" tool Delete all the entries Run "Generate ToC from major headings" I normally add a couple of extra items, like Cover page and Title page OK. When you run the Report tool, the error occurs. To fix... Delete the nav.xhtml and toc.ncx files Recreate the table of contents. This seems to fix whatever the problem is. When I run "Check Book" or "EpubCheck" before the fix, no errors are flagged. Why do I delete the existing TOC? Because I have recreated the chapters and most likely changed them from a <p> tag to the usual <h> tags. Or I have added additional pages like Character Summary. Attached Thumbnails

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11-12-2022, 02:49 AM	#2
kovidgoyal creator of calibre Posts: 45,338 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	https://github.com/kovidgoyal/calibr...d551b3b521831c

11-12-2022, 03:35 AM	#3
Karellen Wizard Posts: 1,611 Karma: 9500498 Join Date: Sep 2021 Location: Australia Device: Kobo Libra 2	Thank you very much @kovidgoyal

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