Error launching Rails server: undefined method 'configure'

Question

I'm new to rails and working through Hartl's tutorial. Everything was fine until I tried to do the tutorial a second time and created another project trying to use the latest version of rails. When I try to load the rails server from the app folder I get the following error.

$ rails s => Booting WEBrick => Rails 4.0.4 application starting in development on => Run `rails server -h` for more startup options => Ctrl-C to shutdown server Exiting /Users/sierra/Desktop/sample_app_2/config/environments/development.rb:1:in   `<top (required)>': undefined method `configure' for   #<SampleApp2::Application:0x00000101a74610> (NoMethodError) 

My Gemfile is directly from the Hartl tutorial:

source 'https://rubygems.org' ruby '2.1.0' #ruby-gemset=railstutorial_rails_4_0  gem 'rails', '4.0.4'  group :development, :test do   gem 'sqlite3', '1.3.8'   gem 'rspec-rails', '2.13.1' end  group :test do   gem 'selenium-webdriver', '2.35.1'   gem 'capybara', '2.1.0' end  gem 'sass-rails', '4.0.1' gem 'uglifier', '2.1.1' gem 'coffee-rails', '4.0.1' gem 'jquery-rails', '3.0.4' gem 'turbolinks', '1.1.1' gem 'jbuilder', '1.0.2'  group :doc do   gem 'sdoc', '0.3.20', require: false end  group :production do   gem 'rails_12factor', '0.0.2' end 

Answer 1

I resolved it by doing following step.

Step 1: go to Project_Root_Directory/config/environment/development.rb

Change this line

Rails.application.configure do 

To

Your_Rails_Application_Folder_name::Application.configure do 

For example my rails project folder name is 'Spree_demo' so Your_Rails_Application_Folder_name in the following line:

Your_Rails_Application_Folder_name::Application.configure do 

will be replaced as

SpreeDemo::Application.configure do 

Note: See underscore in your application folder name it gets removed.

Hope it works for you guys.