thin start Missing the Rails

thin config -C config/thin.yml -c /var/www/rails —port 3010 —servers 3 -e production
thin start -C config/thin.yml

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.

解决方案

减低 rack gem 的版本到 1.1.X