chefを使い始めて、roleの設定などは基本的にはjsonを書き換えて行っていたのですが、knifeコマンドでいろいろnodeなりcookbookの登録なりを設定しようとしたところ、エラーにはまってしまいました、、

error msg

knife cookbook create setup_mysql -o cookbooks/
/opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/specification.rb:2112:in `raise_if_conflicts': Unable to activate knife-zero-1.13.1, because chef-12.5.1 conflicts with chef (~> 12.6) (Gem::ConflictError)
	from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/specification.rb:1280:in `activate'
	from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems.rb:198:in `rescue in try_activate'
	from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems.rb:195:in `try_activate'
	from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:126:in `rescue in require'
	from /opt/chefdk/embedded/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:39:in `require'
	from /Users/yassy/.chefdk/gem/ruby/2.1.0/gems/knife-zero-1.13.1/lib/chef/knife/zero_apply.rb:2:in `<top (required)>'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife/core/subcommand_loader.rb:94:in `load'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife/core/subcommand_loader.rb:94:in `block in load_commands'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife/core/subcommand_loader.rb:94:in `each'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife/core/subcommand_loader.rb:94:in `load_commands'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife/core/subcommand_loader.rb:104:in `load_command'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife/core/subcommand_loader.rb:118:in `command_class_from'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife.rb:137:in `subcommand_class_from'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/knife.rb:198:in `run'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/lib/chef/application/knife.rb:142:in `run'
	from /opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/chef-12.5.1/bin/knife:25:in `<top (required)>'
	from /usr/local/bin/knife:54:in `load'
	from /usr/local/bin/knife:54:in `<main>'

原因

単にchef-client のversion がknife-zero で使いたかったものと異なっていてコンフリクトしてしまっていたよう。

対応

2/2追記:
コメントいただいた下記の対応が正解のようでしたmm

~~参考:http://stackoverflow.com/questions/20205889/how-to-update-the-chef-client-version~~

~~上記のstock-overflowどおりにchef-clientのversionをあげて一旦エラーは出なくなりました~~

~~いまいちchefについてわかっておらず、四苦八苦しましたが、何かの参考まで、、~~