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When I try to run rails server in debugger mode using "rails server --debugger". I am getting the following error on my console.

/home/navyug/.rvm/gems/ruby-1.9.3-p194@global/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36:in `const_missing': uninitialized constant Debugger::LocalInterface::Readline (NameError)
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:55:in `block (2 levels) in initialize'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:53:in `each'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:53:in `block in initialize'
    from /home/navyug/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/open-uri.rb:35:in `open'
    from /home/navyug/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/open-uri.rb:35:in `open'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/interface.rb:52:in `initialize'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/processor.rb:61:in `new'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug/processor.rb:61:in `initialize'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:9:in `new'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:9:in `<module:Debugger>'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:8:in `<top (required)>'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/rack/debugger.rb:9:in `initialize'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:295:in `new'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:295:in `block in build_app'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:291:in `reverse_each'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:291:in `build_app'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands/server.rb:70:in `start'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands.rb:55:in `block in <top (required)>'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands.rb:50:in `tap'
    from /home/navyug/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.7/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

RubyGems Environment

  • RUBYGEMS VERSION: 1.8.24
  • RUBY VERSION: 1.9.3 (2012-04-20 patchlevel 194) [i686-linux]
  • INSTALLATION DIRECTORY: /home/navyug/.rvm/gems/ruby-1.9.3-p194
  • RUBY EXECUTABLE: /home/navyug/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
  • EXECUTABLE DIRECTORY: /home/navyug/.rvm/gems/ruby-1.9.3-p194/bin
  • RUBYGEMS PLATFORMS:
    • ruby
    • x86-linux
  • GEM PATHS:
    • /home/navyug/.rvm/gems/ruby-1.9.3-p194
    • /home/navyug/.rvm/gems/ruby-1.9.3-p194@global
  • GEM CONFIGURATION:
    • :update_sources => true
    • :verbose => true
    • :benchmark => false
    • :backtrace => false
    • :bulk_threshold => 1000
  • REMOTE SOURCES:
Wukerplank
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cgupta
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1 Answers1

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I think the Readline package is missing in your setup. Since you are using RVM, try and install the readline package via rvm. These links might be helpful:

Community
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Kashyap
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