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I have a combined Sinatra/Rails app that shares a session using Rack::Session::Cookie. The app works fine when started with Rack::Handler::Thin.run app , but if the rackup file is start with thin start , I get an error in Rack::Session::Cookie: !! Unexpected error while processing request: no marshal_dump is defined for class Proc no marshal_dump is defined for class Proc /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/session/cookie.rb:64:in `dump' /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/session/cookie.rb:64:in `commit_session' /usr/local/lib/ruby/gems/1.9.1/gems/rack-1.0.1/lib/rack/session/cookie.rb:38:in `call' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:76:in `block in pre_process' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:74:in `catch' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:74:in `pre_process' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:57:in `process' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/connection.rb:42:in `receive_data' /usr/local/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine' /usr/local/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/backends/base.rb:57:in `start' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/server.rb:156:in `start' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/controllers/controller.rb:80:in `start' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/runner.rb:177:in `run_command' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/lib/thin/runner.rb:143:in `run!' /usr/local/lib/ruby/gems/1.9.1/gems/thin-1.2.5/bin/thin:6:in `' The rackup file looks like this: require ::File::dirname(__FILE__) + '/config/environment' require 'thin' app = Rack::Builder.new {

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