Rake - puppet-lint problem (OS X)

gistfile1.sh

android18:puppet-modules zipkid$ rake lint
(in /Volumes/Source/Eclipse-workspace/Super-Visions/puppet-modules)
rake aborted!
Cannot load puppet-lint, please install gem : # gem install puppet-lint
/Volumes/Source/Eclipse-workspace/Super-Visions/puppet-modules/Rakefile:7
(See full trace by running task with --trace)
android18:puppet-modules zipkid$ cat Rakefile 
# Rakefile
desc "Run puppet-lint."
task :lint do |t, args|
  begin
    require 'puppet-lint'
  rescue LoadError
    fail "Cannot load puppet-lint, please install gem : # gem install puppet-lint"
  end
  PuppetLint.configuration.log_format = "%{path}:%{linenumber}:%{check}:%{KIND}:%{message}"
  #PuppetLint.configuration.send("disable_80chars")
  PuppetLint.configuration.disable_80chars
  linter = PuppetLint.new
  files = File.join('./', "**", "*.pp")
  Dir.glob(files).each do |puppet_file|
    puts "Evaluating #{puppet_file}"
    linter.file = puppet_file
    linter.run
  end
endandroid18:puppet-modules zipkid$ irb
>> require 'puppet-lint'
=> true
>> PuppetLint.configuration.log_format = "%{path}:%{linenumber}:%{check}:%{KIND}:%{message}"
=> "%{path}:%{linenumber}:%{check}:%{KIND}:%{message}"
>> PuppetLint.configuration.disable_80chars
=> true
>> linter = PuppetLint.new
=> #<PuppetLint:0x103e88628 @fileinfo={:path=>""}, @statistics={:error=>0, :warning=>0}, @data=nil>
>>   files = File.join('./', "**", "*.pp")
=> "./**/*.pp"
>>   Dir.glob(files).each do |puppet_file|
?>     puts "Evaluating #{puppet_file}"
>>     linter.file = puppet_file
>>     linter.run
>>   end
Evaluating ./apache/manifests/config.pp
Evaluating ./apache/manifests/data.pp
Evaluating ./apache/manifests/htpasswd.pp
...


android18:puppet-modules zipkid$ rake lint --trace
(in /Volumes/Source/Eclipse-workspace/Super-Visions/puppet-modules)
** Invoke lint (first_time)
** Execute lint
rake aborted!
Cannot load puppet-lint, please install gem : # gem install puppet-lint
/Volumes/Source/Eclipse-workspace/Super-Visions/puppet-modules/Rakefile:7
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:636:in `call'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:636:in `execute'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:631:in `each'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:631:in `execute'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:597:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:590:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:583:in `invoke'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2051:in `invoke_task'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2029:in `top_level'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2029:in `each'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2029:in `top_level'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2068:in `standard_exception_handling'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2023:in `top_level'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2001:in `run'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:2068:in `standard_exception_handling'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rake.rb:1998:in `run'
/usr/bin/rake:31


android18:puppet-modules zipkid$ ls -al /Library/Ruby/Gems/1.8/gems/puppet-lint-0.1.13/
total 56
drwxr-xr-x   11 root  wheel   374 May 31 09:09 .
drwxr-xr-x  110 root  wheel  3740 May 31 09:09 ..
-rw-r--r--    1 root  wheel   412 May 31 09:09 .travis.yml
-rw-r--r--    1 root  wheel   168 May 31 09:09 Gemfile
-rw-r--r--    1 root  wheel  1054 May 31 09:09 LICENSE
-rw-r--r--    1 root  wheel  7512 May 31 09:09 README.md
-rw-r--r--    1 root  wheel   590 May 31 09:09 Rakefile
drwxr-xr-x    3 root  wheel   102 May 31 09:09 bin
drwxr-xr-x    4 root  wheel   136 May 31 09:09 lib
-rw-r--r--    1 root  wheel  1462 May 31 09:09 puppet-lint.gemspec
drwxr-xr-x    4 root  wheel   136 May 31 09:09 spec