[Rails] Paginator

hey i m getting an error wen i do da paginating stuff..can u help meh?
n it says ActionController does not contain 'super' method.. bt books
say its valid..y?

Error:
uninitialized constant ApplicationController::Paginator

RAILS_ROOT: /root/knowledge_engine
Application Trace | Framework Trace | Full Trace

/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:105:in
`const_missing'
/root/knowledge_engine/app/controllers/application_controller.rb:45:in
`paginate'
/root/knowledge_engine/app/controllers/posts_controller.rb:7:in `index'
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