cannot load such file -- shoulda/context (LoadError) error ruby 1.9 rails 3.2

cannot load such file -- shoulda/context (LoadError) error ruby 1.9 rails 3.2

I am getting this error when trying to run or migrate my rails app.
ruby-1.9.3-p448/gems/shoulda-3.4.0/lib/shoulda.rb:3:in `require': cannot
load such file -- shoulda/context (LoadError)