ruby on rails - redcloth (MissingSourceFile) - new problem after Heroku changed to bundler 1.0.7 -

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our app had been working. pushed new code staging on heroku 1st time after moved bundler 1.0.7. our app crashes , got error message -

/usr/ruby1.9.1/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `require': no such file load -- redcloth (missingsourcefile)

we're on rails 2.3.8.

here part of gemfile -

gem 'rails',   '2.3.8', :require => nil gem 'redcloth',                   :require => 'redcloth'

any ideas on how fix problem? thanks.

i'm on heroku , have :

gem 'redcloth', '4.2.3'

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