A Mongrel of an Error

I'm a Rails newbie (and a Ruby newbie for that matter).  I am working
my way through the book  href="http://www.amazon.com/Simply-Rails-2-
Patrick-Lenz/dp/0980455200/ref=sr_1_1?
ie=UTF8&s=books&qid=1247152951&sr=8-1">"Simply Rails 2"</a>.

I have generated the model and controller parts of the sample app, at
which point the author instructs the reader to start the web server
and view the app with their browser.

Viewing http://localhost:3000/stories in my browser should display the
file app/views/stories/index.html.erb, but instead displays the
following error:

Status: 500 Internal Server Error Content-Type: text/html
500 Internal Server Error

Any ideas what might be causing this error?


Please see the partial output from the server below:

=> Booting Mongrel (use 'script/server webrick' to force WEBrick)
=> Rails application starting on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...

 
*******************************************************************
      * config.breakpoint_server has been deprecated and has no
effect. *
 
*******************************************************************

** Rails loaded.
** Loading any Rails specific GemPlugins
** Signals ready.  TERM => stop.  USR2 => restart.  INT => stop (no
restart).
** Rails signals registered.  HUP => reload (without restart).  It
might not work well.
** Mongrel 1.1.4 available at 0.0.0.0:3000
** Use CTRL-C to stop.
/!\ FAILSAFE /!\  Fri Jul 10 01:07:17 +1000 2009
  Status: 500 Internal Server Error
  A secret is required to generate an integrity hash for cookie
session data. Use config.action_controller.session = { :session_key =>
"_myapp_session", :secret => "some secret phrase of at least 30
characters" } in config/environment.rb
    /Library/Ruby/Gems/1.8/gems/actionpack-2.0.2/lib/action_controller/
session/cookie_store.rb:91:in `ensure_secret_secure'
    /Library/Ruby/Gems/1.8/gems/actionpack-2.0.2/lib/action_controller/
session/cookie_store.rb:60:in `initialize'
...

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