Stuck with a main.lua filter error rendering a Quarto complex project

[r-scotti]

Description

Hello,
I am rendering a document that has 'childs' and 'childs' of 'childs' and I am now stuck with the following lua error. The document used to render before I updated parts of my environment.
I do not how to reduce the code to a simple "Reproducible Quarto Document" still throwing the error.

When I click on the Render button the process flows well up to the following step

   .... (omitted) ..............

output file: 2018MarganaiSoilErosionExperimentalEvaluation_Copernicus.knit.md
pandoc
to: latex
output-file: 2018MarganaiSoilErosionExperimentalEvaluation_Copernicus.tex
standalone: true
pdf-engine: pdflatex
variables:
graphics: true
tables: true
default-image-extension: pdf

   .... (omitted) ..............

citation: true
bibliography:
- bib/references.bib

Error running filter /opt/quarto/share/filters/main.lua:
/opt/quarto/share/filters/main.lua:15155: attempt to get length of a boolean value (upvalue 'subcaps')
stack traceback:
[C]: in ?
[C]: in method 'walk'
/opt/quarto/share/filters/main.lua:224: in function </opt/quarto/share/filters/main.lua:214>
(...tail calls...)
/opt/quarto/share/filters/main.lua:15153: in local 'fn'
/opt/quarto/share/filters/main.lua:2554: in function </opt/quarto/share/filters/main.lua:2548>
(...tail calls...)
...... (omitted last lines are repeated)

My environment:

• quarto --version --> 1.4.553
• OS Linux Ubuntu 20.04

If it is not possible to identify and solve the problem with just the above information, please instruct on how I can provide more.
Many thanks for any help

[mcanouil]

From the log "subcaps", you should check for figures/tables sub captions.

Without any code, we can't do more.

[r-scotti]

I have figures and tables but no subcaptions. I understand the requirement for code, in case I can share the project, it is on GitLab, but I am afraid it is not the right way. Can you suggest how to focus on the relevant lines? Many thanks Roberto Scotti Pubblicazioni: https://www.zotero.org/groups/2543874/prof._roberto_scotti Il Mer 1 Mag 2024, 13:56 Mickaël Canouil ***@***.***> ha scritto:

…

From the log "subcaps", you should check for figures/tables sub captions. Without any code, we can't do more. — Reply to this email directly, view it on GitHub <#9546 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEAKXD74NPS5PZ7UMLIHG7DZADKAHAVCNFSM6AAAAABHB3LBIGVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4TEOBUGUZDM> . You are receiving this because you authored the thread.Message ID: ***@***.***>

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[mcanouil]

If you don't share code there is nothing we can do.

You need to debug this yourself.
The usual method is either to start small and add small pieces or remove small pieces and render until you find where is the issue.
We unfortunately don't have the time to do this process for you.

[r-scotti]

I made some progress.
Inserting the following chunk

save.image("phase2.Rdata")
knit_exit()

I found a way to create a kind of breakpoint.
Moving it through the Quarto file I could spot the chunk(s) that would abort the rendering.
Apparently (in contrast with the example in https://quarto.org/docs/authoring/cross-references.html ) the

#| tbl-subcap: true

option was causing the problem!
If I remove true and specify the sub captions adding

   - a
   - b

the rendering completes.

---
title: "Reproducible Quarto Document"
format: pdf
editor: visual
---

```{r}
#| label: tbl-tables
#| tbl-cap: "Tables"
#| tbl-subcap:
#|  - a
#|  - b
#| layout-ncol: 2

library(knitr)
kable(head(cars))
kable(head(pressure))

[mcanouil]

I need to check because it should work, if not (even on the development version), then there is a bug (or even a regression) in Quarto.

[cscheid]

I can reproduce a crash. To be clear, fig-subcap: true doesn't make sense in your context, because the figures you're producing do not have captions. fig-subcap: true exists to tell Quarto that the captions you've provided are meant to be interpreted as subcaptions. If you haven't provided captions, then there's nothing that Quarto can do.

We shouldn't crash, but you also need to fix your code.

[mcanouil]

I am creating an issue for this.

Note that it's documented at https://quarto.org/docs/authoring/cross-references.html#floats

[mcanouil]

• *-subcap not working as expected and crashing #9550

[cscheid]

Oh, huh. That's obnoxious. My understanding of the intent of fig-subcap: true is so that if your embedded figures (or tables) have captions in them, we know to interpret them as subcaptions rather than multiple full figures with captions.

Now I need to confirm this with the other devs...