undefined local variable or method `config' for main:Object - rails

Question

When I run the rails application, I get the following error:

undefined local variable or method "config" for main:Object

How can I resolve it?

Is this displaying in the console, or a log? Please post the entire backtrace. Also post the code which the backtrace points you to. — Alex D, Jan 31 '12 at 05:38
I don't know anything about Ruby on Rails, but I know enough about programming to know that good programming questions should include code. — Cody Gray - on strike, Jan 31 '12 at 05:54

score 5 · Answer 1 · answered Apr 09 '12 at 16:02

5

My guess is that you found some code examples from an older version of rails, which called for you to place a config.gem * in your environment.rb file. To fix this add the gem requirement to your gemfile.

answered Apr 09 '12 at 16:02

jimmiebtlr

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score 1 · Answer 2 · answered Sep 06 '13 at 12:58

1

in your enviroment.rb file, cut any line starting with config and paste into your production.rb/development.rb/test.rb instead.

This is what worked for me when I had a similar problem.

answered Sep 06 '13 at 12:58

The Ref

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score 0 · Answer 3 · answered Apr 25 '14 at 03:29

I had this problem when an application had been upgraded from Rails 2 to Rails 3. It worked in development but I got this error when running in production mode for the first time because config/environments/production.rb contained Rails 2-style lines such as:

config.cache_classes = true

..which needed converting to Rails 3-style:

<<NameOfYourApp>>::Application.configure do

  config.cache_classes = true
end

undefined local variable or method `config' for main:Object - rails

3 Answers3

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