[version]this feature is not available in your current Hugo version

[RRoundTable]

I can't build site.

OS: windows 10
hugo: hugo_0.55.5_Windows-64bit

$ hugo server
Building sites … ERROR 2019/06/28 15:52:11 error: failed to transform resource: TOCSS: failed to transform "styles/main-rendered.scss" (text/x-scss): this feature is not available in your current Hugo version, see https://goo.gl/YMrWcn for more information
Total in 17 ms
Error: Error building site: logged 1 error(s)

[chouj]

Error message contains a link for you to look for the solution.

I encountered this too. Should be clarified in the README.

[RRoundTable]

https://gohugo.io/troubleshooting/faq/#i-get-this-feature-is-not-available-in-your-current-hugo-version

it says we should install extended version.