Q:

SECURITY WARNING - Rails Generate static_pages

I'm going through the RailsTutorial and I'm stuck on the Test driven development section.
when I call 
$ rails generate integration_test static_pages

    SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
    This poses a security threat. It is strongly recommended that you
    provide a secret to prevent exploits that may be possible from crafted
    cookies. This will not be supported in future versions of Rack, and
    future versions will even invalidate your existing user cookies.

    Called from: /Users/Marcus/.rvm/gems/ruby-1.9.3-p448@rails3tutorial2ndEd/gems/actionpack-3.2.3/lib/action_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.

I have received a similar error when I run
$ rails server

Marcuss-MacBook-Pro-2:public Marcus$ rails s
=> Booting WEBrick
=> Rails 3.2.3 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
    SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
    This poses a security threat. It is strongly recommended that you
    provide a secret to prevent exploits that may be possible from crafted
    cookies. This will not be supported in future versions of Rack, and
    future versions will even invalidate your existing user cookies.

    Called from: /Users/Marcus/.rvm/gems/ruby-1.9.3-p448@rails3tutorial2ndEd/gems/actionpack-3.2.3/lib/action_dispatch/middleware/session/abstract_store.rb:28:in `initialize'.

The server will run, but this error occurs. Does anyone know how to solve this issue?
Thanks - let me know if you need any more information. 

A:

It looks like you are using Rails 3.2.3. This issue was fixed in Rails 3.2.11. Upgrading Rails to the latest in the 3.2 series (currently 3.2.15) will fix this issue, as well as protect you from some serious security flaws that were fixed in versions higher than the one you're using.

