我正在閱讀Hartl ruby on rails教程（第2.2節），而在遷移數據庫時遇到了麻煩。一切似乎都正常，然后我運行rails generate scaffold User name:string email:string 之后，我嘗試運行包exec rake db：migrate并收到以下錯誤消息：$ bundle exec rake db:migrate                                                                                 == 20141125234257 CreateUsers: migrating ======================================-- create_table(:users)   -> 0.0079s== 20141125234257 CreateUsers: migrated (0.0080s) =============================rake aborted!StandardError: An error has occurred, this and all later migrations canceled:wrong number of arguments (1 for 0)/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `initialize'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `new'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb:271:in `substitute_at'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:97:in `block in substitute_values'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `each'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `each_with_index'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:96:in `substitute_values'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/relation.rb:56:in `insert'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/persistence.rb:521:in `_create_record'/usr/local/rvm/gems/ruby-2.1.4@rails4/gems/activerecord-4.2.0.beta4/lib/active_record/counter_cache.rb:139:in `_create_record'Tasks: TOP => db:migrate(See full trace by running task with --trace)我嘗試返回到較早的提交，然后再次運行所有內容，但收到相同的錯誤消息。我是否還應該添加其他文件來幫助解決此問題？