[Rails] devise rails3, flash messages

I am playing with a simple rails 3 app.
has anyone gotten the flash messages and flash error messages broken
/ not displaying?

when I first accessed the view I got this:

DEPRECATION WARNING: f.error_messages was removed from Rails and is
now available as a plugin. Please install it with `rails plugin
install git://github.com/rails/dynamic_form.git`. (called from
___ibrary__uby__ems_____gems_devise_____rc__app_views_devise_registrations_new_html_erb__677218867_2175630380_0
at /Library/Ruby/Gems/1.8/gems/devise-1.1.rc0/app/views/devise/registrations/new.html.erb:4)

I installed the pluggin but am not sure if anything further is needed.
Currently the app does not display the flash message for stuff like,
you have successfully logged out / in etc.

Anyone has encountered this?

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