ERRORS: Having trouble rendering/compiling css template + Browser queries must be an array or string. Got object.

[techbridgedev]

Enabling the plugin via eleventyConfig.addPlugin(lightningCSS); in .eleventy.js produces the following error:

[11ty] 1. Having trouble rendering css template ./src/Box.css (via TemplateContentRenderError)
[11ty] 2. Having trouble compiling template ./src/Box.css (via TemplateContentCompileError)
[11ty] 3. Browser queries must be an array or string. Got object. (via BrowserslistError)
[11ty] 
[11ty] Original error stack trace: BrowserslistError: Browser queries must be an array or string. Got object.
[11ty]     at checkQueries (/projects/eleventy/node_modules/browserslist/index.js:387:11)
[11ty]     at browserslist (/projects/eleventy/node_modules/browserslist/index.js:398:3)
[11ty]     at Object.compile (/projects/eleventy/node_modules/@11tyrocks/eleventy-plugin-lightningcss/.eleventy.js:100:43)
[11ty]     at CustomEngine.compile (/projects/eleventy/node_modules/@11ty/eleventy/src/Engines/Custom.js:201:7)
[11ty] Wrote 0 files in 0.01 seconds (v2.0.1)

If I rename or delete Box.css I get the same error, but for the next CSS file in my project (/src/Center.css).

I'm configuring browserslist in my package.json, but I've also tried the default method and produced the same error.

Contents of .eleventy.js