Undefined method error when running "rails generate rspec:install" - ruby-on-rails

Question

I'm working through chapter 3 of Michael Hartl's tutorial and I tried running "rails generate rspec:install" and I get the error message below.
C:\Sites\sample_app>rails generate rspec:install
DL is deprecated, please use Fiddle
C:/Sites/sample_app/config/environments/development.rb:1:in `<top (required)>':
undefined method `configure' for #<SampleApp::Application:0x380cda8> (NoMethodEr
ror)
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.8/lib/active_support/dependencies.rb:229:in `require'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.8/lib/active_support/dependencies.rb:229:in `block in require'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.8/lib/active_support/dependencies.rb:214:in `load_dependency'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.8/lib/active_support/dependencies.rb:229:in `require'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/engine.rb:591:in `block (2 levels) in <class:Engine>'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/engine.rb:590:in `each'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/engine.rb:590:in `block in <class:Engine>'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/initializable.rb:30:in `instance_exec'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/initializable.rb:30:in `run'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/initializable.rb:55:in `block in run_initializers'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:150:in `block i
n tsort_each'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:183:in `block (
2 levels) in each_strongly_connected_component'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:210:in `block (
2 levels) in each_strongly_connected_component_from'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:219:in `each_st
rongly_connected_component_from'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:209:in `block i
n each_strongly_connected_component_from'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/initializable.rb:44:in `each'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/initializable.rb:44:in `tsort_each_child'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:203:in `each_st
rongly_connected_component_from'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:182:in `block i
n each_strongly_connected_component'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:180:in `each'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:180:in `each_st
rongly_connected_component'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:148:in `tsort_e
ach'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/initializable.rb:54:in `run_initializers'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/application.rb:215:in `initialize!'
from C:/Sites/sample_app/config/environment.rb:5:in `<top (required)>'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/application.rb:189:in `require'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/application.rb:189:in `require_environment!'
from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.8
/lib/rails/commands.rb:44:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
Here is my gemfile
source 'https://rubygems.org'
ruby '2.0.0'
#ruby-gemset=railstutorial_rails_4_0
gem 'rails', '4.0.8'
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 'pg', '0.15.1'
gem 'rails_12factor', '0.0.2'
end
The first line of my config/enivronments/development.rb file
Rails.application.configure do
I looked up some other answers to this question. And they suggested changing the first line in my development.rb file to SampleApp:Application.configure.do; but that just leads to another error 'unitialized constant SampleApp'. So I I changed it back to default.
EDIT: Fixed it to SampleApp::Application, got this cmd line message after running "rails generate rspec:install"
C:\Sites\sample_app>rails generate rspec:install
DL is deprecated, please use Fiddle
create .rspec
create spec
create spec/spec_helper.rb

Answer 1

Thanks, ok change the first line to
SampleApp::Application.configure do
Looks like you missed the double ::.
Credit to this S.O. answer.