Missing the Rails 2.3.8 gem. Please `gem install -v=2.3.8 rails`, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed.
一直报如上错误。最后发现是rack的版本问题。
rails 2.3.4和2.3.8 对应 rack 1.0.1
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