[Conversion Output] KFX Output - Page 111

tomsem · 06-25-2025, 01:14 AM

I believe it is table of contents is too large. If you load your ePub into Kindle Previewer directly you should get the same error, since that is what KFX Output is using.

And Send To Kindle will likely fail for the same reason, I think the conversion code is similar if not identical. I had it fail with an omnibus 'collected works' with something like 1800 entries in it.

JSWolf · 06-25-2025, 08:26 AM

The error message is pretty specific. You have a table with more than 1800 cells. You need to split that table in two so there are less then 1800 cells in each table.

jhowell · 06-25-2025, 09:35 AM

The table of contents is not a “table” in the sense meant by this error message. It is referring to an HTML table.

You may be able to locate the large table and manually split it into smaller ones using calibre’s editor, but that will require knowledge of HTML to accomplish.

If you are not up to doing that I suggest converting this book to AZW3 instead of KFX.

beatlesfan5858 · 06-25-2025, 11:08 PM

Quote:

Originally Posted by jhowell

The table of contents is not a “table” in the sense meant by this error message. It is referring to an HTML table.

You may be able to locate the large table and manually split it into smaller ones using calibre’s editor, but that will require knowledge of HTML to accomplish.

If you are not up to doing that I suggest converting this book to AZW3 instead of KFX.

Thanks. I don't know how to split my book into a smaller HTML tables. How would I go about doing this? Is there an easy way I can do it within Calibre?

theducks · 06-26-2025, 12:17 AM

Quote:

Originally Posted by beatlesfan5858

Thanks. I don't know how to split my book into a smaller HTML tables. How would I go about doing this? Is there an easy way I can do it within Calibre?

Easy? For me or anyone knowing HTML, yes, using the (calibre) Editor

The most difficult bit is finding a logical spot to break a huge table into 2 or more parts

A Table starts with a <table> tag
and ends with </table>

Look at any Calibre Generated Jacket's code for a simple use example

In your case, you probably want to duplicate the column headers at each split

dendron · 07-07-2025, 06:04 PM

Quote:

Originally Posted by jhowell

I am curious about what is present in those books leading to them being rejected by the Kindle Previewer. I will look into the root cause if you either post an EPUB with copyrighted content removed using the ScrambleEbook plugin or PM me a link to an original file that produces this error. (I understand if you are not interested in tasking this any further.)

I ran into the same problem as DoctorOhh.

Trying to open the EPUB in Kindle Previewer (v3.96.0) or to convert it into KFX using the plugin yields this error message:

Code:

E21018: Enhanced Mobi building failure, while parsing content in the file. Content: <img> in file: OEBPS\chapter.xhtml line: 267

It is rather weird because the lines that are referenced do not even contain an <img> element.

I will attach the scrambled EPUB for further investigation.

theducks · 07-07-2025, 07:47 PM

That book page (chapter) has an insane number of stylesheets.
I am not even sure I could do a trace to figure which one really had control.

Error line #'s are when the error became obvious and can be way down the line from the opening tag (eg You are closing a nest of tags with on inside still open)

jhowell · 07-08-2025, 03:35 PM

Quote:

Originally Posted by dendron

I ran into the same problem as DoctorOhh.
...
I will attach the scrambled EPUB for further investigation.

Thank you for posting that.

Quote:

Originally Posted by dendron

Trying to open the EPUB in Kindle Previewer (v3.96.0) or to convert it into KFX using the plugin yields this error message:

Code:

E21018: Enhanced Mobi building failure, while parsing content in the file. Content: <img> in file: OEBPS\chapter.xhtml line: 267

It is rather weird because the lines that are referenced do not even contain an <img> element.

I was able to find the cause of the problem. It is actually on line 270, not on line 267 as indicated in the error message.

It appears that the existence of ">" (a greater than character) in the "alt" attribute of an img element triggers a conversion failure in Amazon's kindlegen, which is used by the Kindle Previewer as part of the process of converting to KFX format.

The next release of the KFX Output plugin will remove those characters from image alt text prior to conversion in order to avoid this problem.

Drybonz · 07-08-2025, 07:18 PM

What is the "no body tag" error when converting? Is there a way to get this conversion to finish?

calibre, version 8.5.0
ERROR: KFX conversion failed:
Cannot convert
Conversion error: E19001: No BODY tag found in content file.

jhowell · 07-09-2025, 07:34 AM

Quote:

Originally Posted by Drybonz

What is the "no body tag" error when converting? Is there a way to get this conversion to finish?

I have not seen that error and do not know what could be causing it for you.

If you post a scrambled version of the book you are trying to convert I will take a look at it and try to determine the cause of the failure.

Drybonz · 07-09-2025, 10:09 AM

Quote:

Originally Posted by jhowell

If you post a scrambled version of the book you are trying to convert I will take a look at it and try to determine the cause of the failure.

Thank you for that. I tried the scrambler and couldn't remove certain elements of the book so that it felt completely obscured to me, so I decided not to post it, but thanks again for your help.

JSWolf · 07-10-2025, 06:44 AM

Quote:

Originally Posted by Drybonz

Thank you for that. I tried the scrambler and couldn't remove certain elements of the book so that it felt completely obscured to me, so I decided not to post it, but thanks again for your help.

You don't need to remove anything as we cannot tell what the original was.

JBaby · 07-12-2025, 08:18 PM

How do I get the make EBOK checkbox stay checked? Now I have to click it for every book and it’s slowing my progress. I never want PDOC because I want Goodreads integration.

I’m an idiot. I didn’t go to Preferences > Output Options.

jhowell · 07-13-2025, 08:32 AM

Version 2.16.0 - 13 Jul 2025

Detect Kindle Previewer versions up to 3.96.0.

Prevent conversion failure in cases where image alt text contains a greater-than character. (Fixes "E21018: Enhanced Mobi building failure, while parsing content in the file. Content: <img> in file ...")

jacobp · 07-24-2025, 08:45 PM

Thanks for this plugin jwhowell. I'm having issues updating the cover of my PDOC kfx kindle documents. Some context:

I make an exact replica kindle create, import my pdf, preserve links, and export as a kpf. I then convert to kfx with `calibre-debug -r "KFX Output" -- -p 0 "book.kpf"`. Within Calibre, I have the kfx output plugin installed with the 'Enable updating of all KFX metadata` option enabled, along with the included KFX metadata plugin enabled. However, when I send the book to the kindle with the proper cover in the calibre book metadata, the kindle shows the first page of the book as the cover. I've tried resending it, waiting a while, and playing around with the metadata within Calibre but no luck.

If anyone could help me out with this I would appreciate it. Thanks.

07-08-2025, 07:18 PM	#1659
Drybonz Connoisseur Posts: 93 Karma: 10 Join Date: Apr 2010 Device: iPad, Kindle Scribe 2024	What is the "no body tag" error when converting? Is there a way to get this conversion to finish? calibre, version 8.5.0 ERROR: KFX conversion failed: Cannot convert Conversion error: E19001: No BODY tag found in content file. Last edited by Drybonz; 07-08-2025 at 07:21 PM.

07-12-2025, 08:18 PM	#1663
JBaby Addict Posts: 251 Karma: 3755662 Join Date: May 2013 Location: Parsons, KS Device: 1st Gen Colorsoft SE, 2024 11” M4 iPad Pro & iPhone 15 Pro Max	[Conversion Output] KFX Output How do I get the make EBOK checkbox stay checked? Now I have to click it for every book and it’s slowing my progress. I never want PDOC because I want Goodreads integration. I’m an idiot. I didn’t go to Preferences > Output Options. Last edited by JBaby; 07-12-2025 at 08:20 PM.

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06-25-2025, 01:14 AM	#1651
tomsem Grand Sorcerer Posts: 7,111 Karma: 28000001 Join Date: Apr 2009 Location: USA Device: iPhone 15PM, Kindle Scribe, iPad mini 6, PocketBook InkPad Color 3	I believe it is table of contents is too large. If you load your ePub into Kindle Previewer directly you should get the same error, since that is what KFX Output is using. And Send To Kindle will likely fail for the same reason, I think the conversion code is similar if not identical. I had it fail with an omnibus 'collected works' with something like 1800 entries in it.

06-25-2025, 08:26 AM	#1652
JSWolf Resident Curmudgeon Posts: 81,827 Karma: 150266009 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	The error message is pretty specific. You have a table with more than 1800 cells. You need to split that table in two so there are less then 1800 cells in each table.

06-25-2025, 09:35 AM	#1653
jhowell Grand Sorcerer Posts: 7,234 Karma: 95000001 Join Date: Nov 2011 Location: Charlottesville, VA Device: Kindles	The table of contents is not a “table” in the sense meant by this error message. It is referring to an HTML table. You may be able to locate the large table and manually split it into smaller ones using calibre’s editor, but that will require knowledge of HTML to accomplish. If you are not up to doing that I suggest converting this book to AZW3 instead of KFX.

07-07-2025, 07:47 PM	#1657
theducks Well trained by Cats Posts: 31,436 Karma: 62503914 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	That book page (chapter) has an insane number of stylesheets. I am not even sure I could do a trace to figure which one really had control. Error line #'s are when the error became obvious and can be way down the line from the opening tag (eg You are closing a nest of tags with on inside still open)

07-13-2025, 08:32 AM	#1664
jhowell Grand Sorcerer Posts: 7,234 Karma: 95000001 Join Date: Nov 2011 Location: Charlottesville, VA Device: Kindles	Version 2.16.0 - 13 Jul 2025 Detect Kindle Previewer versions up to 3.96.0. Prevent conversion failure in cases where image alt text contains a greater-than character. (Fixes "E21018: Enhanced Mobi building failure, while parsing content in the file. Content: <img> in file ...")

07-24-2025, 08:45 PM	#1665
jacobp Junior Member Posts: 4 Karma: 10 Join Date: Jul 2025 Device: Kindle scribe	Thanks for this plugin jwhowell. I'm having issues updating the cover of my PDOC kfx kindle documents. Some context: I make an exact replica kindle create, import my pdf, preserve links, and export as a kpf. I then convert to kfx with `calibre-debug -r "KFX Output" -- -p 0 "book.kpf"`. Within Calibre, I have the kfx output plugin installed with the 'Enable updating of all KFX metadata` option enabled, along with the included KFX metadata plugin enabled. However, when I send the book to the kindle with the proper cover in the calibre book metadata, the kindle shows the first page of the book as the cover. I've tried resending it, waiting a while, and playing around with the metadata within Calibre but no luck. If anyone could help me out with this I would appreciate it. Thanks.

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