@server.mount "/admin", Rack::Handler::WEBrick, JekyllAdmin::StaticServer

[jack1ripper]

Description:

I build a brand new blog with jekyll , and then a added jekyll-admin , and
my app crashed with sass warnings and errors blow:

sass warnings

 myblog  bundle exec jekyll serve
logger was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add logger to your Gemfile or gemspec to silence this warning.
csv was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.4.0.
You can add csv to your Gemfile or gemspec to silence this warning.
/Users/dengxiang/.rubies/ruby-3.3.5/lib/ruby/3.3.0/json/common.rb:3: warning: ostruct was loaded from the standard library, but will no longer be part of the default gems starting from Ruby 3.5.0.
You can add ostruct to your Gemfile or gemspec to silence this warning.
Configuration file: /Users/dengxiang/Jekyll/myblog/_config.yml
            Source: /Users/dengxiang/Jekyll/myblog
       Destination: /Users/dengxiang/Jekyll/myblog/_site
 Incremental build: disabled. Enable with --incremental
      Generating... 
       Jekyll Feed: Generating feed for posts
Deprecation Warning: lighten() is deprecated. Suggestions:

color.scale($color, $lightness: 81.6%)
color.adjust($color, $lightness: 40%)

More info: https://sass-lang.com/d/color-functions

   ╷
18 │ $grey-color-light: lighten($grey-color, 40%) !default;
   │                    ^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    minima.scss 18:20                                    @import
    /Users/dengxiang/Jekyll/myblog/assets/main.scss 1:9  root stylesheet
Deprecation Warning: darken() is deprecated. Suggestions:

color.scale($color, $lightness: -49.0384615385%)
color.adjust($color, $lightness: -25%)

More info: https://sass-lang.com/d/color-functions

   ╷
19 │ $grey-color-dark:  darken($grey-color, 25%) !default;
   │                    ^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    minima.scss 19:20                                    @import
    /Users/dengxiang/Jekyll/myblog/assets/main.scss 1:9  root stylesheet
Deprecation Warning: darken() is deprecated. Suggestions:

error

  /Users/James/.gem/ruby/3.3.5/gems/jekyll-admin-0.11.1/lib/jekyll/commands/serve.rb:23:in `jekyll_admin_monkey_patch': uninitialized constant Rack::Handler (NameError)
          @server.mount "/admin", Rack::Handler::WEBrick, JekyllAdmin::StaticServer
                                      ^^^^^^^^^
        from /Users/dengxiang/.gem/ruby/3.3.5/gems/jekyll-admin-0.11.1/lib/jekyll/commands/serve.rb:15:in `start_up_webrick'
        from /Users/dengxiang/.gem/ruby/3.3.5/gems/jekyll-4.3.4/lib/jekyll/commands/serve.rb:102:in `process'
        from /Users/dengxiang/.gem/ruby/3.3.5/gems/jekyll-4.3.4/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
        from /Users/dengxiang/.gem/ruby/3.3.5/gems/jekyll-4.3.4/lib/jekyll/command.rb:91:in `each'

Tell us a bit about yourself:

Gems included by the bundle:
  * addressable (2.8.7)
  * base64 (0.2.0)
  * bigdecimal (3.1.8)
  * bundler (2.5.21)
  * colorator (1.1.0)
  * concurrent-ruby (1.3.4)
  * em-websocket (0.5.3)
  * eventmachine (1.2.7)
  * ffi (1.17.0)
  * forwardable-extended (2.6.0)
  * google-protobuf (4.28.2)
  * http_parser.rb (0.8.0)
  * i18n (1.14.6)
  * jekyll (4.3.4)
  * jekyll-admin (0.11.1)
  * jekyll-feed (0.17.0)
  * jekyll-sass-converter (3.0.0)
  * jekyll-seo-tag (2.8.0)
  * jekyll-watch (2.2.1)
  * kramdown (2.4.0)
  * kramdown-parser-gfm (1.1.0)
  * liquid (4.0.4)
  * listen (3.9.0)
  * mercenary (0.4.0)
  * minima (2.5.2)
  * multi_json (1.15.0)
  * mustermann (3.0.3)
  * pathutil (0.16.2)
  * public_suffix (6.0.1)
  * rack (3.1.7)
  * rack-protection (4.0.0)
  * rack-session (2.0.0)
  * rackup (2.1.0)
  * rake (13.2.1)
  * rb-fsevent (0.11.2)
  * rb-inotify (0.11.1)
  * rexml (3.3.8)
  * rouge (4.4.0)
  * ruby2_keywords (0.0.5)
  * safe_yaml (1.0.5)
  * sass-embedded (1.79.5)
  * sinatra (4.0.0)
  * sinatra-contrib (4.0.0)
  * terminal-table (3.0.2)
  * tilt (2.4.0)
  * unicode-display_width (2.6.0)
  * webrick (1.8.2)

• Version of JekyllAdmin I'm using <HINT: use bundle show to check>: 0.11.1

• Version of Jekyll I'm using <HINT: use bundle show to check>: 4.3.4

• Version of NodeJS I'm using <HINT: use node -v to check>: v16.19.1

• Operating System <e.g. OS X, Windows>: mac os

• Browser <e.g, Safari, Chrome>: chrome

Steps to reproduce:

follow jekyll guide build my app , and then add admin plugin then it happens

I expected the following:

I expect I could open admin GUI with :4000/admin

But got the following, instead:

I tried add rackup into gem ,still the same.

this is the my gemfile

group :jekyll_plugins do
  gem "jekyll-feed", "~> 0.12"
  gem "jekyll-admin"    (the is the line I added into the file)
  gem "rackup"             (the is the line I added into the file)
end

this is my config.yml

theme: minima
plugins:
  - jekyll-feed
  - jekyll-admin  (the is the only line I added into the file)

then I bundle install and jekyll S, and fail

[ashmaroli]

Thanks for the detailed report, @jack1ripper. This issue is being handled and has been previously reported via #705

[Ches-ctrl]

Same issue for me

[ashmaroli]

Addressed via #715