我尝试使用Jekyll新命令，但是它不起作用，并在出现错误后出现。

$ jekyll new myblog
/Library/Ruby/Gems/1.8/gems/commander-4.1.6/lib/commander/runner.rb:385:in `require_program': program version required (Commander::Runner::CommandError)
from /Library/Ruby/Gems/1.8/gems/commander-4.1.6/lib/commander/runner.rb:384:in `each'
from /Library/Ruby/Gems/1.8/gems/commander-4.1.6/lib/commander/runner.rb:384:in `require_program'
from /Library/Ruby/Gems/1.8/gems/commander-4.1.6/lib/commander/runner.rb:52:in `run!'
from /Library/Ruby/Gems/1.8/gems/commander-4.1.6/lib/commander/delegates.rb:8:in `run!'
from /Library/Ruby/Gems/1.8/gems/commander-4.1.6/lib/commander/import.rb:10
from /usr/bin/jekyll:23
/Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:in `gem_original_require': no such file to load -- json (LoadError)
from /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/1.8/gems/jekyll-1.4.3/bin/../lib/jekyll/filters.rb:2
from /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:in `gem_original_require'
from /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/1.8/gems/jekyll-1.4.3/bin/../lib/jekyll.rb:44
from /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:in `gem_original_require'
from /Library/Ruby/Site/1.8/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Gems/1.8/gems/jekyll-1.4.3/bin/jekyll:7
from /usr/bin/jekyll:23:in `load'
from /usr/bin/jekyll:23

我正在使用Mac OS X 10.8.5 Mountain Lion。

发现有类似问题的帖子。 运行jekyllnew命令时出错，) 
$ sudo gem install json

但这对我的情况不起作用。我卸载并重新安装了json，但没有任何反应。如果您知道其他解决方案，请告诉我。自本周初以来，我一直在解决这个问题。

我的宝石清单和宝石环境如下。

$ gem list

*** LOCAL GEMS ***

bigdecimal (1.2.4)
blankslate (2.1.2.4)
classifier (1.3.4)
colorator (0.1)
commander (4.1.6)
fast-stemmer (1.0.2)
ffi (1.9.3)
highline (1.6.21)
io-console (0.4.2)
jekyll (1.4.3)
json (1.8.1)
liquid (2.5.5)
listen (1.3.1)
maruku (0.7.1)
minitest (4.7.5)
parslet (1.5.0)
posix-spawn (0.3.8)
psych (2.0.3)
pygments.rb (0.5.4)
rake (10.1.0)
rb-fsevent (0.9.4)
rb-inotify (0.9.3)
rb-kqueue (0.2.2)
rdoc (4.1.0)
redcarpet (2.3.0)
safe_yaml (0.9.7)
test-unit (2.1.1.0)
toml (0.1.1)
yajl-ruby (1.1.0)

$ gem env

RubyGems Environment:
  - RUBYGEMS VERSION: 2.2.2
  - RUBY VERSION: 2.1.1 (2014-02-24 patchlevel 76) [x86_64-darwin12.0]
  - INSTALLATION DIRECTORY: /usr/local/Cellar/ruby/2.1.1/lib/ruby/gems/2.1.0
  - RUBY EXECUTABLE: /usr/local/Cellar/ruby/2.1.1/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/local/Cellar/ruby/2.1.1/bin
  - SPEC CACHE DIRECTORY: /Users/MyName/.gem/specs
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-12
  - GEM PATHS:
     - /usr/local/Cellar/ruby/2.1.1/lib/ruby/gems/2.1.0
     - /Users/MyName/.gem/ruby/2.1.0
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - https://rubygems.org/
  - SHELL PATH:
     - /usr/local/bin
     - /usr/local/bin
     - /usr/local/sbin
     - /usr/bin
     - /bin
     - /usr/sbin
     - /sbin
     - /usr/local/git/bin
     - /Users/MyName/.rvm/bin

请给我建议以帮助我。谢谢！

3月7日更新。

$ rvm list    
rvm rubies


# No rvm rubies installed yet. Try 'rvm help install'.

以防万一您想查看自制软件列表，

$ brew list
autoconf    gmp4        libtool     openssl     readline
automake    libgpg-error    libyaml     pkg-config  ruby
cloog-ppl015    libksba     llvm        ppl011      ruby-build
gcc46       libmpc08    mpfr2       rbenv

2月3日更新。

$ which ruby
/usr/local/bin/ruby

$ which jekyll
/usr/bin/jekyll

$ ruby --version
ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin12.0]

$ echo $PATH
/usr/local/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/git/bin:/Users/MyName/.rvm/bin

我记得我的Mac在安装2.1.1p76之前已经安装了Ruby 1.8.7。