dally errors on heroku cedar stack

environment.rb

    require 'active_support/cache/dalli_store23'
    config.cache_store = :dalli_store
    
    config.middleware.use ::Radiant::Cache,
      :metastore => "memcached://#{ENV['MEMCACHE_SERVERS']}:11211/meta",
      :entitystore => "memcached://#{ENV['MEMCACHE_SERVERS']}:11211/body"

heroku log output

2011-11-10T18:11:48+00:00 heroku[web.1]: State changed from created to starting
2011-11-10T18:11:59+00:00 heroku[web.1]: Starting process with command `bundle exec thin start -p 26285`
2011-11-10T18:12:02+00:00 app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/dalli-1.1.3/lib/active_support/cache/dalli_store23.rb:16:in `<module:Cache>': uninitialized constant ActiveSupport::Cache::Store (NameError)
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/dalli-1.1.3/lib/active_support/cache/dalli_store23.rb:10:in `<module:ActiveSupport>'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/dalli-1.1.3/lib/active_support/cache/dalli_store23.rb:9:in `<top (required)>'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/config/environment.rb:54:in `require'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/config/environment.rb:54:in `block in <top (required)>'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/rails-2.3.14/lib/initializer.rb:111:in `run'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/bundler/gems/radiant-7457001ebc87/lib/radiant/initializer.rb:266:in `run'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/config/environment.rb:12:in `<top (required)>'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/rack/adapter/rails.rb:37:in `require'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/rack/adapter/rails.rb:37:in `load_application'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/rack/adapter/rails.rb:23:in `initialize'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/rack/adapter/loader.rb:48:in `new'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/rack/adapter/loader.rb:48:in `for'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/thin/controllers/controller.rb:169:in `load_adapter'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/thin/controllers/controller.rb:73:in `start'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/thin/runner.rb:185:in `run_command'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/lib/thin/runner.rb:151:in `run!'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.2.8/bin/thin:6:in `<top (required)>'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/bin/thin:19:in `load'
2011-11-10T18:12:02+00:00 app[web.1]: 	from /app/vendor/bundle/ruby/1.9.1/bin/thin:19:in `<main>'
2011-11-10T18:12:02+00:00 app[web.1]: >> Using rails adapter
2011-11-10T18:12:02+00:00 heroku[web.1]: Process exited
2011-11-10T18:12:03+00:00 heroku[web.1]: State changed from starting to crashed