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_我已经覆盖了Python交互式解释器中的下划线变量。如何在不重新启动解释器的情况下使下划线再次工作？

当我尝试运行时:'rails generate devise:install'

我得到以下内容:

`There was an error while trying to load the gem 'devise'.
Gem Load Error is: undefined method `alias_method_chain' for
ActionDispatch::Routing::RouteSet:Class
Did you mean?  alias_method`

我的Gemfile:源' https://rubygems.org '

gem 'devise'
gem 'rails', '~> 5.1.0'
gem 'sqlite3'
gem 'puma', '~> 3.7'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'

gem 'coffee-rails', '~> 4.2'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.5'

group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'capybara', '~> 2.13.0'
  gem 'selenium-webdriver'
end …