Ruby on Rails

I am working with railspace social networking application. I did login
logout registration process in it but as i am introducing the concept
for remember me then stuck in the problem. it is showing the following
error.

private method `gsub' called for 4:Fixnum

C:/Users/Amir/Downloads/IR/ruby/lib/ruby/1.8/cgi.rb:342:in `escape'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_ext/cookie.rb:73:in
`to_s'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_ext/cookie.rb:73:in
`collect'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cgi_ext/cookie.rb:73:in
`to_s'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cookies.rb:80:in
`set_cookie'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/cookies.rb:65:in
`[]='
app/controllers/user_controller.rb:27:in `login'

Please help me out. Any help is appreciated

Thanks

Amir

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