在 rvm 上使用 ruby 2.5.1 跑 rails 5.2.1 時會發生的警告：already initialized constant FileUtils::VERSION

在 rvm 上使用 ruby 2.5.1 跑 rails 5.2.1 時會發生的警告：already initialized constant FileUtils::VERSION 詳細警告訊息如下： ``` /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:90: warning: already initialized constant FileUtils::VERSION /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:92: warning: previous definition of VERSION was here /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1188: warning: already initialized constant FileUtils::Entry_::S_IF_DOOR /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:1267: warning: previous definition of S_IF_DOOR was here /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1446: warning: already initialized constant FileUtils::Entry_::DIRECTORY_TERM /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:1541: warning: previous definition of DIRECTORY_TERM was here /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1448: warning: already initialized constant FileUtils::Entry_::SYSCASE /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:1543: warning: previous definition of SYSCASE was here /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1501: warning: already initialized constant FileUtils::OPT_TABLE /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:1596: warning: previous definition of OPT_TABLE was here /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1555: warning: already initialized constant FileUtils::LOW_METHODS /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:1650: warning: previous definition of LOW_METHODS was here /Users/etrex/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/fileutils.rb:1562: warning: already initialized constant FileUtils::METHODS /Users/etrex/.rvm/gems/ruby-2.5.1/gems/fileutils-1.1.0/lib/fileutils.rb:1657: warning: previous definition of METHODS was here Rails 5.2.1 ``` 排除方法： ``` gem uninstall fileutils ```