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I'm going through the tekpub rack tutorial but when I try to run even a basic program in rack i get this error. ERROR Rack::Lint::LintError: Response body must respond to each /Users/adam/.rvm/gems/ruby-1.9.3-preview1/gems/rack-1.3.4/lib/rack/lint.rb:19:in `assert' /Users/adam/.rvm/gems/ruby-1.9.3-preview1/gems/rack-1.3.4/lib/rack/lint.rb:513:in `each' /Users/adam/.rvm/gems/ruby-1.9.3-preview1/gems/rack-1.3.4/lib/rack/body_proxy.rb:23:in `method_missing' /Users/adam/.rvm/gems/ruby-1.9.3-preview1/gems/rack-1.3.4/lib/rack/chunked.rb:23:in `each' /Users/adam/.rvm/gems/ruby-1.9.3-preview1/gems/rack-1.3.4/lib/rack/handler/webrick.rb:71:in `service' /Users/adam/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' /Users/adam/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' /Users/adam/.rvm/rubies/ruby-1.9.3-preview1/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' This is the program im trying to run: class EnvironmentOutput def call(env) ["200",{"Content-Type" => "text/plain"}, "Hello World"] end end run EnvironmentOutput.new I'm a beginner programmer so I'm not sure whats going on. Tried google searches but nothing has come up. Using ruby 1.9.3 Rack 1.1 Thanks

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