I added these lines to my config / initializer
require 'memprof/middleware' config.middlewares.use(Memprof::Middleware) require 'memprof/tracer' config.middleware.insert(0, Memprof::Tracer)
Getting this error
config/environments/development.rb:98:in `load_environment': undefined method `middlewares' for #<Rails::Configuration:0xb73dd47c> (NoMethodError) from /usr/lib/ruby/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:386:in `load_environment' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.14/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:379:in `load_environment' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:137:in `process' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:113:in `send' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.14/lib/initializer.rb:113:in `run' from /home/krunals/ms/trunk/2012-06-18-01-MangoApps/config/environment.rb:22 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:49:in `gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:49:in `require' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.14/lib/active_support/dependencies.rb:182:in `require' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.14/lib/active_support/dependencies.rb:547:in `new_constants_in' from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.14/lib/active_support/dependencies.rb:182:in `require' from /usr/lib/ruby/gems/1.8/gems/rails-2.3.14/lib/commands/server.rb:84 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:49:in `gem_original_require' from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:49:in `require' from script/server:3
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