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bundle exec thin --trace  -C /etc/thin/webistrano.yml start

Stack trace :
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.21/lib/bundler/rubygems_integration.rb:143:in `gem': thin is not part of the bundle. Add it to Gemfile. (Gem::LoadError)

source "http://rubygems.org"

gem 'bundler', "~>1.0.10"
gem "rails", "2.3.11"
gem "mysql"
gem "erubis"
gem "rake"
gem "syntax", "1.0.0"
gem "capistrano", "2.6.0"
gem "open4", "0.9.3"
gem "exception_notification", "2.3.3.0"

group :test do
  gem "mocha", "0.9.8"
end