ruby on rails - Heroku throws error on db:migrate rake -

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when i'm trying throw heroku run rake db:migrate said in ror tutorial michael hartl throws me following:

running rake db:migrate on shielded-reaches-4728... up, run.2183 rake aborted! nomethoderror: undefined method 'configure' #<sampleapp::application:0x007efe8ced6138> /app/config/environments/production.rb:1:in '<top (required)>' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in 'require' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in 'block in require' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:214:in 'load_dependency' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.2/lib/active_support/dependencies.rb:229:in 'require' .. tasks: top => db:migrate => environment (see full trace running task --trace)

what can do?

update: production.rb file:

rails.application.configure    config.cache_classes = true    config.eager_load = true    config.consider_all_requests_local       = false   config.action_controller.perform_caching = true    config.serve_static_assets = false    config.assets.js_compressor = :uglifier    config.assets.compile = false    config.assets.digest = true    config.log_level = :info    config.i18n.fallbacks = true    config.active_support.deprecation = :notify    config.log_formatter = ::logger::formatter.new   config.active_record.dump_schema_after_migration = false end

it looks you've got this

...  module sampleapp   class application < rails::application  ...

in application.rb file. in case, in production.rb file, need change

rails.application.configure

to

sampleapp::application.configure

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