Rails / Memcached Error on Heroku -

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i'm running issue using memcached rails 3.2.11 , dalli 2.6.4 on heroku. memcached works great in development, when push staging environment on heroku i'm running following error when hit cached page or when write rails.cache.clear in console:

nomethoderror: undefined method `split' nil:nilclass /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/server.rb:35:in `initialize' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:334:in `new' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:334:in `block in ring' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:326:in `map' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:326:in `ring' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/dalli/client.rb:238:in `flush' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/active_support/cache/dalli_store.rb:196:in `block in clear' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/active_support/cache/dalli_store.rb:291:in `block in instrument' /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/notifications.rb:125:in `instrument' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/active_support/cache/dalli_store.rb:291:in `instrument' /app/vendor/bundle/ruby/1.9.1/gems/dalli-2.6.4/lib/active_support/cache/dalli_store.rb:195:in `clear' /app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.11/lib/active_support/cache/strategy/local_cache.rb:88:in `clear' (irb):1 /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start' /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start' /app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.11/lib/rails/commands.rb:41:in `<top (required)>' script/rails:6:in `require' script/rails:6:in `<main>'

the relevant parts of staging.rb:

config.cache_store = :dalli_store, nil, {:namespace => 'staging', :expires_in => 1.day.to_i, :compress => true }  config.action_dispatch.rack_cache = nil

any idea might causing issue?

still not sure problem was, switching using dalli 1.1.5 fixed everything.


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