Error: root/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.8/lib/bundler/runtime.rb:34:in `block in setup': You have already activated spring 1.3.6, but your Gemfile requires spring 1.3.4. Prepending `bundle exec` to your command may solve this. (Gem::LoadError) Error: root/.rbenv/versions/2.2.
阅读背景：
rails g scaffold Error
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Error: root/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.8/lib/bundler/runtime.rb:34:in `block in setup': You have already activated spring 1.3.6, but your Gemfile requires spring 1.3.4. Prepending `bundle exec` to your command may solve this. (Gem::LoadError) Error: root/.rbenv/versions/2.2.
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