Could not connect to the PostCSS server

[dunward]

I try to setup this in local and follow the steps.
clone, install dependencies, and run server bundle exec jekyll serve --config _config.yml,_config-dev.yml --livereload

And I got this error log

F:\simplicity>bundle exec jekyll serve --config _config.yml,_config-dev.yml --livereload
Configuration file: F:/simplicity/_config.yml
Configuration file: F:/simplicity/_config-dev.yml
                    ------------------------------------------------
      Jekyll 4.3.3   Please append `--trace` to the `serve` command
                     for any additional information or backtrace.
                    ------------------------------------------------
C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:70:in `rescue in start_dev_server': Could not connect to the PostCSS server (RuntimeError)
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:61:in `start_dev_server'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:13:in `initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `new'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `block in initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `fetch'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `new'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `block (2 levels) in instantiate_subclasses'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `map!'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `block in instantiate_subclasses'
        from <internal:kernel>:90:in `tap'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:319:in `instantiate_subclasses'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:133:in `setup'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:36:in `initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/commands/build.rb:30:in `new'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/commands/build.rb:30:in `process'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/command.rb:91:in `each'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/command.rb:91:in `process_with_graceful_fail'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/commands/serve.rb:86:in `block (2 levels) in init_with_program'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/exe/jekyll:15:in `<top (required)>'
        from C:/Ruby33-x64/bin/jekyll:25:in `load'
        from C:/Ruby33-x64/bin/jekyll:25:in `<main>'
C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:62:in `initialize': No connection could be made because the target machine actively refused it. - connect(2) for "localhost" port 8124 (Errno::ECONNREFUSED)
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:62:in `open'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:62:in `start_dev_server'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll-postcss/socket.rb:13:in `initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `new'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `block in initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `fetch'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-postcss-0.5.0/lib/jekyll/converters/postcss.rb:16:in `initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `new'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `block (2 levels) in instantiate_subclasses'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `map!'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:321:in `block in instantiate_subclasses'
        from <internal:kernel>:90:in `tap'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:319:in `instantiate_subclasses'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:133:in `setup'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/site.rb:36:in `initialize'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/commands/build.rb:30:in `new'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/commands/build.rb:30:in `process'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/command.rb:91:in `each'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/command.rb:91:in `process_with_graceful_fail'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/lib/jekyll/commands/serve.rb:86:in `block (2 levels) in init_with_program'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
        from C:/Ruby33-x64/lib/ruby/gems/3.3.0/gems/jekyll-4.3.3/exe/jekyll:15:in `<top (required)>'
        from C:/Ruby33-x64/bin/jekyll:25:in `load'
        from C:/Ruby33-x64/bin/jekyll:25:in `<main>'