# Demo crashes

**URL:** <https://www.ruby-forum.com/t/demo-crashes/144888>\
**Category:** Rails\
**Created:** [August 4, 2008, 12:32am UTC](https://www.ruby-forum.com/t/demo-crashes/144888 "2008-08-04T00:32:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![random52k](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/7bcc69/32.png) [@random52k](https://www.ruby-forum.com/u/random52k)\
**Post date:** [August 4, 2008, 12:32am UTC](https://www.ruby-forum.com/t/demo-crashes/144888/1 "2008-08-04T00:32:30Z")

</div>

When I develop a new application using “rails demo” then run “ruby  
script/server” WEBrick loads fine. I point my browser to  
[http://localhost:3000](http://localhost:3000). The Welcome aboard page loads fine. But when I  
click on “About your application’s environment” I get this error:

CGI::Session::CookieStore::TamperedWithCookie in  
Rails/infoController#properties

CGI::Session::CookieStore::TamperedWithCookie

When I try “rails -d mysql demo” I get the same error.

any ideas?

mike