Cannot run Jekyll new command - ruby

Question

I tried to use Jekyll new command, but it didn't work and came out following errors.
$ 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
I'm using Mac OS X 10.8.5 Mountain Lion.
I checked stackoverflow and found a post which has a similar problem.
Error when running jekyll new command
Then I tried the below command.
$ sudo gem install json
but It didn't work for my situation. I uninstalled and reinstalled json but nothing happened.
Please let me know if you know any other solutions. I've been stuck on this problem since the beginning of the week...
my gem list & gem environment are as follows.
$ 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
Please give me advice to help me. Thank you!
Updated on Mar 7.
$ rvm list
rvm rubies
# No rvm rubies installed yet. Try 'rvm help install'.
Just in case you would like to see Homebrew list,
$ 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
2nd updated on Mar 7.
$ 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
I remember that my mac had been installed Ruby 1.8.7 before I installed 2.1.1p76.

Answer 1

It looks like you have multiple versions of Ruby on your system (1.8.7 and 2.1.1), which is very common, and part of the reason tools like rvm and rbenv were created. The issue is that when you did gem install jekyll (maybe with a sudo) and sudo gem install json, these seem to have ended up in different spots and aren't finding each other. The /usr/local/bin location is typically where Homebrew puts things (hence, you have ruby listed under brew list) and this is your Ruby 2.1.1 location. However, your jekyll installation is under the location of the Apple-installed Ruby 1.8.7.
Step 1: try gem uninstall jekyll, then gem install jekyll. This should fix your problems.
Step 2: If that doesn't work, try to use rbenv or rvm to select a different version of Ruby, then try Step 1 again.
For example, my installations are here (managed via rvm):
$ which jekyll
/Users/nicksuch/.rvm/gems/ruby-2.0.0-p247/bin/jekyll
$ which gem
/Users/nicksuch/.rvm/rubies/ruby-2.0.0-p247/bin/gem
$ which ruby
/Users/nicksuch/.rvm/rubies/ruby-2.0.0-p247/bin/ruby

Answer 2

In my case the Jekyll template suggested to use bundle utility as:
bundle exec jekyll build
The solution was to include json into Gemfile (which was already part of the sources):
diff --git a/Gemfile b/Gemfile
index 98b29af..b8537cf 100644
--- a/Gemfile
+++ b/Gemfile
## -1,7 +1,8 ##
source "https://rubygems.org"
+gem "json"
gem "jekyll", "~> 3.0"
gem "jekyll-sitemap"
DETAILS
What lead me to the solution was the following fact:
command gem list json showed json gem installed;
but command bundle exec gem list json didn't show anything.
I also tried to run bundle exec gem install json - it didn't work. My best guess was that bundle sets up the environment for a single run based on Gemfile which is the only way to make set of dependencies persistent across each bundle exec ... executions.