There is an issue when I open PlantUML with VSCode. It seems only happen when we install graphviz from brew. The warning is like:

Dot Executable: /opt/local/bin/dot File does not exist
Cannot find Graphviz. You should try
...

Solution

add ⬇️ to settings.json in VSCode

"plantuml.commandArgs": [
    "-DGRAPHVIZ_DOT="{PATH_TO_GRAPHVIZ}/bin/dot",
]

in my case, the path is /opt/homebrew/Cellar/graphviz/3.0.0/bin/dot.

If don’t know where it is, we could check it by brew info graphviz.

Then preview the PlantUML diagram again, the problem is solved.

References

• https://github.com/qjebbs/vscode-plantuml/issues/94