Why the stylelint vscode extension is not working on my computer?

I follow the guide to install stylelint vscode extension, but it does not work on my computer.

I'm pretty sure that I follow all the necessary steps.

• Install Extensions.
• Disable the built-in linters in User setting.
• Use npm to install stylelint and its standard configuration.
• Create a .stylelintrc.json configuration file in the root of my project.
• Run stylelint from command-line.

But the extention still not automatically validate the css, what is going wrong?

After reading the guide again, I found the setting stylelint.config and understand its definition:

Set stylelint config option. Note that when this option is enabled, stylelint doesn't load configuration files.

So I look at my vscode user setting, oh, stylelint.config: {}. After changing it to null, stylelint automatically validates the css file immediately.

Phew~