ERROR: TypeError: Cannot read properties of undefined (reading 'toLowerCase')

[cfreder2]

Bug description

I have the Quarto Extension Enabled.

I made a very simple test.qmd file in that produces the ERROR: TypeError: Cannot read properties of undefined (reading 'toLowerCase') when previewing the notebook in Positron.

Working Quarto Example (No python code block):

---

title: "Untitled" format: html

Test

Failing Quarto Example (HAS a python code block):

title: "Untitled" format: html

Test

i=10

Steps to reproduce

---

title: "Untitled" format: html

Test

i=10

Expected behavior

Quarto Renders HTML page served locally

Actual behavior

quarto preview test.qmd --no-browser --no-watch-inputs ERROR: TypeError: Cannot read properties of undefined (reading 'toLowerCase')

TypeError: Cannot read properties of undefined (reading 'toLowerCase') at jupyterKernelspecFromMarkdown (file:///Applications/quarto/bin/quarto.js:53170:41) at async quartoMdToJupyter (file:///Applications/quarto/bin/quarto.js:53021:36) at async createNotebookforTarget (file:///Applications/quarto/bin/quarto.js:55428:16) at async Object.target (file:///Applications/quarto/bin/quarto.js:55221:18) at async fileExecutionEngineAndTarget (file:///Applications/quarto/bin/quarto.js:58033:20) at async renderContexts (file:///Applications/quarto/bin/quarto.js:82635:34) at async renderFormats (file:///Applications/quarto/bin/quarto.js:82688:26) at async previewFormat (file:///Applications/quarto/bin/quarto.js:102399:36) at async preview (file:///Applications/quarto/bin/quarto.js:102303:20) at async Command.fn (file:///Applications/quarto/bin/quarto.js:103770:9)

Your environment

Positron (2024.08.0 (Universal) build 83). Python 3.12.0 IPython 8.17.2

Quarto check output

quarto check

[✓] Checking versions of quarto binary dependencies... Pandoc version 3.1.1: OK Dart Sass version 1.55.0: OK [✓] Checking versions of quarto dependencies......OK [✓] Checking Quarto installation......OK Version: 1.3.450 Path: /Applications/quarto/bin

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

[✓] Checking Python 3 installation....OK Version: 3.12.0 Path: /usr/local/bin/python3.12 Jupyter: 5.5.0 Kernels: ir, sparkrkernel, powershell, pysparkkernel, sparkkernel, python3

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

[cscheid]

Version: 1.3.450

Can you please upgrade to 1.5.57 or later? That's two stable versions behind.

[cfreder2]

@cscheid Ah, I didn't realize I was so far behind. Upgrading to 1.5.57 fixed it. Closing the issue.

[mcanouil]

@cfreder2 for future bug reports, please do read the guidelines (provided at the top when filling an issue), especially about formatting code. Your report is almost ineligible as is and not useful as we can't see/use it.