添加Linkedin身份验证时发生迁移错误

我正在尝试在我的Rails应用程序中使用Linkedin的api进行身份验证。我是Rails的新手，所以我遵循了本指南http://sourcey.com/rails-4-omniauth-using-devise-with-twitter-facebook-and-linkedin/

我尝试运行rake db：migrate，但出现此错误。完整的跟踪信息如下。我还添加了environment.rb文件，因为我认为这是问题所在，但我不确定。此外，如果有人对使用带有rails的linkedin api有更好的指导，请分享！谢谢您的帮助！

耙子流产了！NameError：未定义的局部变量或方法config' for main:Object /Users/alexanderkehaya/Desktop/codea/codea_app/config/environment.rb:4:in'/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:247:inrequire' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:247:in块在require中/ Users / alexanderkehaya / .rvm / gems / ruby​​-2.1.2 / gems / activesupport-4.1.5 / lib / active_support / dependencies.rb：232：in load_dependency' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:247:inrequire' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/ gems / railties-4.1.5 / lib / rails / application.rb：276：require_environment!' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/railties-4.1.5/lib/rails/application.rb:379:in在run_tasks_blocks的/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake中/task.rb:240：call' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:240:in执行中的代码块/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:235：each' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:235:in执行中的代码/用户/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:179:inblock in invoke_with_call_chain' /Users/alexanderkehaya/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/monitor.rb:211:inmon_synchronize'/Users invoke_with_call_chain' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:201:in/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/ task.rb:172：在invoke_prerequisites的/Users/alexanderkehaya/.rvm/gems中/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:199：在each' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:199:ininvoke_prerequisites的/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3中。 2 / lib / rake / task.rb：178：in block in invoke_with_call_chain' /Users/alexanderkehaya/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/monitor.rb:211:inmon_synchronize' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb: 172 :ininvoke_with_call_chain' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/task.rb:165:in在'top_level'中调用'/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/application.rb:150：在invoke_task' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/application.rb:106:in块中（2级） .rvm / gems / ruby​​-2.1.2 / gems / rake-10.3.2 / lib / rake / application.rb：106：each' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/application.rb:106:in在top_level的块中/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/ gems / rake-10.3.2 / lib / rake / application.rb：115：在run_with_threads' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/application.rb:100:intop_level'/Users/ block in run' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/application.rb:176:inalexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/lib/rake/application.rb: 78:in standard_exception_handling'/Users/alexanderkehaya/.rvm/gems/ruby -2.1.2 /宝石/耙10.3.2 / LIB /耙/ application.rb中：75：在run' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/gems/rake-10.3.2/bin/rake:33:in'/Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/bin/rake:23:in load' /Users/alexanderkehaya/.rvm/gems/ruby-2.1.2/bin/rake:23:in'任务：TOP => db：migrate =>环境

environemnt.rb文件

require File.expand_path('../application', __FILE__)

config.app_domain = 'somedoamin.com'

config.action_mailer.delivery_method = :smtp
config.action_mailer.perform_deliveries = true
config.action_mailer.default_url_options = { host: config.app_domain }
config.action_mailer.smtp_settings = {
  address: 'smtp.gmail.com', 
  port: '587',
  enable_starttls_auto: true,
  user_name: 'someuser',
  password: 'somepass',
  authentication: :plain,
  domain: 'somedomain.com'
 }

Rails.application.initialize!