当我运行“ rails generate scaffold用户名：string email：string ”抛出以下错误时，请提前感谢。
/Users/mithunraj.nanjegowda/projects/ruby/rails_projects/demo_app/config/environments/development.rb:1:in `<top (required)>': undefined method `configure' for #<DemoApp::Application:0x007fc8e1507fb0> (NoMethodError)
from /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.0.4/lib/active_support/dependencies.rb:229:in `require'
from /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.0.4/lib/active_support/dependencies.rb:229:in `block in require'
我的红宝石环境如下所示
RubyGems Environment:
- RUBYGEMS VERSION: 2.2.2
- RUBY VERSION: 2.0.0 (2014-02-24 patchlevel 451) [x86_64-darwin13.1.0]
- INSTALLATION DIRECTORY: /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0
- RUBY EXECUTABLE: /Users/mithunraj.nanjegowda/.rvm/rubies/ruby-2.0.0-p451/bin/ruby
- EXECUTABLE DIRECTORY: /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/bin
- SPEC CACHE DIRECTORY: /Users/mithunraj.nanjegowda/.gem/specs
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-13
- GEM PATHS:
- /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0
- /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@global
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/bin
- /Users/mithunraj.nanjegowda/.rvm/gems/ruby-2.0.0-p451@global/bin
- /Users/mithunraj.nanjegowda/.rvm/rubies/ruby-2.0.0-p451/bin
- /Users/mithunraj.nanjegowda/.rvm/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
- /usr/local/bin