YAMLException Error while using _brand.yml

[JohannHenning-LNP]

Description

I'm trying to compile a reveljs presentation using a snippet from the _brand.yml example.

File location ./brand/brand.yml:

---
color:
  palette:
    dark-grey: "#222222"
    blue: "#ddeaf1"
  background: blue
  foreground: dark-grey
  primary: black

typography:
  fonts:
    - family: Jura
      source: google
  base: Jura
  headings: Jura
---

My presentation file located at ./presentation.qmd:

---
title: 2024 in a Nutshell
format: revealjs
brand: ./brand/brand.yml
---

# slide 1

# slide 2

# slide 3

Output quarto check:

Quarto 1.7.6
[✓] Checking environment information...
      Quarto cache location: /home/johann/.cache/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.7.6
      Path: /opt/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: v2024.11
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /home/johann/.TinyTeX/bin/x86_64-linux
      Version: 2024

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.12.7
      Path: /home/johann/.local/share/virtualenvs/data-analysis-ZXrbRR71/bin/python3
      Jupyter: 5.7.2
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.4.2
      Path: /usr/lib64/R
      LibPaths:
        - /usr/lib/R/library
      knitr: (None)
      rmarkdown: (None)

      The knitr package is not available in this R installation.
      Install with install.packages("knitr")
      The rmarkdown package is not available in this R installation.
      Install with install.packages("rmarkdown")

The error I get when running quarto preview ./presentation.qmd:

ERROR: YAMLException: expected a single document in the stream, but found more

Stack trace:
    at load$1 (file:///opt/quarto/bin/quarto.js:14828:11)
    at buildJsYamlAnnotation (file:///opt/quarto/bin/quarto.js:15600:5)
    at readAnnotatedYamlFromMappedString (file:///opt/quarto/bin/quarto.js:15500:16)
    at readAndValidateYamlFromMappedString (file:///opt/quarto/bin/quarto.js:15864:30)
    at readAndValidateYamlFromFile (file:///opt/quarto/bin/quarto.js:20490:50)
    at projectResolveBrand (file:///opt/quarto/bin/quarto.js:40048:33)
    at async resolveFormats (file:///opt/quarto/bin/quarto.js:80569:23)
    at async renderContexts (file:///opt/quarto/bin/quarto.js:80401:21)
    at async renderFormats (file:///opt/quarto/bin/quarto.js:80445:22)
    at async file:///opt/quarto/bin/quarto.js:107961:24

Some system info:

                    johann@JohannLenovolaptop
         /\         
        /  \       Arch Linux x86_64
       /    \      - Linux 5.15.153.1-microsoft-standard-WSL2
      /      \     - 546 (pacman)
     /   ,,   \    - 2 hours, 16 mins
    /   |  |   \   - 2.12 GiB / 7.62 GiB (28%)
   /_-''    ''-_\
                    Γùå Γùå Γùå Γùå Γùå Γùå Γùå Γùå

[mcanouil]

The _brand.yml you showed is not from the documentation. Yours is not valid as it contains ---.

[JohannHenning-LNP]

You are completely right, my bad for misunderstanding the difference between frontmatter (encapsulated by ---) and straight .yml files.