I was trying to use Zdoc theme for my Hugo website but when I ran it, it threw the following error message.

hugo server -D
Error: Error building site: TOCSS: failed to transform "main_parsed.scss" (text/x-scss): resource "scss/sass/main.scss_b4f67ac5085b89b62b54c1923e5a9145" not found in file cache

Solution

Go to https://github.com/gohugoio/hugo/releases and get the extended version of Hugo. I wasn't aware that Zdoc requires the extended version.