I followed the instructions to install the extended hugo version including cloning the right branch. After that I entert the command hugo server and got this:
Start building sites …
WARN 2020/09/23 14:00:26 Page.URL is deprecated and will be removed in a future release. Use .Permalink or .RelPermalink. If what you want is the front matter URL value, use .Params.url
Built in 9482 ms
Error: Error building site: POSTCSS: failed to transform “dist/style.css” (text/css): resource “scss/styles/style.scss_62339886d3e1c8db4cb2ed3154f69184” not found in file cache
Hugo Pipe’s PostCSS requires the postcss-cli JavaScript package to be installed in the environment ( npm install -g postcss-cli ) along with any PostCSS plugin(s) used (e.g., npm install -g autoprefixer ).
If you are using the Hugo Snap package, PostCSS and plugin(s) need to be installed locally within your Hugo site directory, e.g., npm install postcss-cli without the -g flag.
And the WARN is unrelated to the error which should be solved by @jmooring’s answer. For this WARN message search your repo for .Page.URL and replace it with .Permalink like the message suggests. Finding it might be harder - if so please put your repo public online somewhere and we’ll dig in.