Rails application error

I'm getting this error when I try and run my Rails application:

/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:406:in `initialize_components': undefined method `first' for :notification_views:Symbol (NoMethodError)
from /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:340:in `initialize'
from /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:616:in `connect'
from /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:645:in `named_route'
from /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:651:in `method_missing'
from /Users/Mike/Documents/dotherightthing/config/../config/routes.rb:2
from /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/routing.rb:625:in `draw'
from /Users/Mike/Documents/dotherightthing/config/../config/routes.rb:1
from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:140:in `load'
... 11 levels...
from /usr/local/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel_rails:85:in `run'
from /usr/local/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/lib/mongrel/command.rb:211:in `run'
from /usr/local/lib/ruby/gems/1.8/gems/mongrel-0.3.13.4/bin/mongrel_rails:231
from /usr/local/bin/mongrel_rails:18

How can I fix this? Thanks.