Error running new app - CGI::Session::CookieStore::TamperedWithCookie in BookController#index

Yes I am a very newbie to Ruby on Rails. Just few hours back

- Ruby 1.8.6 (on windows XP)
- Installed MySQL
- installed Rails 2.2.2 (using gem "gem install rails")
- created a sample application following the OnLamp article advice
("rails demo") (article link -
- changed the default database to be used as MySQL using ( "rails demo
-d mysql")
- started WEBrick ("ruby script/server")
- Created a new controller ( "ruby script/generate controller Book")

When I try to use the root url http://localhost:3000/ I see the
defualt page correctly .. but when I try to http://localhost:3000/Book
and I get an error page:

CGI::Session::CookieStore::TamperedWithCookie in BookController#index





I have no clue what is going on.. please HELP. I am completely


While playing around to setup my rails to use my MySQL …now… I get following :

onnection_adapters/abstract_adapter.rb:38: [BUG] Segmentation fault
ruby 1.8.6 (2008-08-11) [i386-mswin32]

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application’s support team for more information.

WEBrick crashes… I just installed the mysql gem package thats it.


I got that exception yesterday. I only did “Empty cache” of Safari and works…