新电脑 干净环境 安装报错

请问这是什么问题？如何处理？

环境：

MacOS (10.14.5)
XCode (11.3)
Gem (3.1.1)
RVM (1.29.9)
Ruby (2.6.3)

执行：

$ sudo gem install -n /usr/local/bin cocoapods // 成功

$ pod setup // 报错

报错内容如下：

Traceback (most recent call last):
    6: from /Users/apple/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:10:in `<main>'
    5: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:49:in `run'
    4: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:49:in `each'
    3: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:50:in `block in run'
    2: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/rubygems-bundler-1.4.5/lib/rubygems_executable_plugin.rb:4:in `block in <top (required)>'
    1: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
/Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require': cannot load such file -- rubygems-bundler/noexec (LoadError)
    10: from /Users/apple/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:10:in `<main>'
     9: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:49:in `run'
     8: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:49:in `each'
     7: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/executable-hooks-1.6.0/lib/executable-hooks/hooks.rb:50:in `block in run'
     6: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/rubygems-bundler-1.4.5/lib/rubygems_executable_plugin.rb:4:in `block in <top (required)>'
     5: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:156:in `require'
     4: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:168:in `rescue in require'
     3: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:168:in `require'
     2: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:131:in `<top (required)>'
     1: from /Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:124:in `check'
/Users/apple/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/rubygems-bundler-1.4.5/lib/rubygems-bundler/noexec.rb:84:in `setup': undefined method `plain_specs' for #<Bundler::RubygemsIntegration:0x00007f8db60194b0> (NoMethodError)