### Bug description

I'm trying to figure out an error, but I can't get a sense of what it means at all. I'm using 0.9.603 in VSCode and Python on Windows.

This happens when I run `preview` on my `.qmd` file.

```
Starting python3 kernel...Done

Executing 'paper.ipynb'
  Cell 1/7...Done
  Cell 2/7...Done
  Cell 3/7...Done
  Cell 4/7...ERROR: 

None of the known patterns match for   omitted due to data restrictions.
```

Any idea what might be causing this?

here's my quarto check:

```
[✓] Checking Quarto installation......OK
      Version: 99.9.9
      Path: /home/am2497/quarto-cli/package/dist/bin

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

[✓] Checking Python 3 installation....OK
      Version: 3.9.7 (Conda)
      Path: /home/am2497/miniconda3/envs/uganda-uber/bin/python
      Jupyter: 4.9.1
      Kernels: minimod-env, python3

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

[✓] Checking R installation...........OK
      Version: 4.0.5
      Path: /home/am2497/miniconda3/envs/uganda-uber/lib/R
      LibPaths:
        - /home/am2497/miniconda3/envs/uganda-uber/lib/R/library
      rmarkdown: (None)

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


### Checklist

- [X] [formatted your issue](https://yihui.org/issue/#please-format-your-issue-correctly) so it is easier for us to read?
- [X] included a minimal, self-contained, and reproducible example?
- [X] documented the quarto version you're running, by providing the output produced by `quarto check` in a terminal in your issue?
- [X] documented the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] documented which operating system you're running? If on Linux, please provide the specific distribution as well.
- [X] upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?
cscheid
2022-06-21T16:44:43Z
amichuda
bug yaml-validation needs-repro
Future
closed
Strange error about pattern matching
https://github.com/quarto-dev/quarto-cli/issues/1194