Using jekyll serve causes error: cannot load such file -- webrick (LoadError)

[Saptam04]

Using bundle exec jekyll serve -w causes the following error:

Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Configuration file: PathtoDir/_config.yml
            Source: PathtoDir
       Destination: PathtoDir/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
                    done in 0.153 seconds.
  Please add the following to your Gemfile to avoid polling for changes:
    gem 'wdm', '>= 0.1.0' if Gem.win_platform?
 Auto-regeneration: enabled for 'PathtoDir'
                    ------------------------------------------------
      Jekyll 4.2.0   Please append `--trace` to the `serve` command
                     for any additional information or backtrace.
                    ------------------------------------------------
C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve/servlet.rb:3:in `require': cannot load such file -- webrick (LoadError)
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve/servlet.rb:3:in `<top (required)>'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve.rb:179:in `require_relative'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve.rb:179:in `setup'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve.rb:100:in `process'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `each'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `process_with_graceful_fail'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/lib/jekyll/commands/serve.rb:86:in `block (2 levels) in init_with_program'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
        from C:/Ruby31-x64/lib/ruby/gems/3.1.0/gems/jekyll-4.2.0/exe/jekyll:15:in `<top (required)>'
        from C:/Ruby31-x64/bin/jekyll:25:in `load'
        from C:/Ruby31-x64/bin/jekyll:25:in `<main>'

Seems as if the webrick gem is necessary for running the command which is missing from the Gemfile.

[shinwookim]

Adding gem "webrick" to your gemfile, or installing it via bundler should fix it ($ bundle add webrick)