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最近在做Flutter开发，在跑iOS的时候报错：

结论：CocoaPods安装有问题

解决办法：

先卸载本地CocoaPods，然后重新安装

查看当前版本

gem list | grep cocoapods

执行卸载

sudo gem uninstall cocoapods

直到

which -a pod

为空

然后重新安装

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

这里会卡住等待，安装完成以后

pod setup

如果报错：

/Library/Ruby/Gems/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:16:in `<module:LoggerThreadSafeLevel>': uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger (NameError)from /Library/Ruby/Gems/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:9:in `<module:ActiveSupport>'from /Library/Ruby/Gems/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_thread_safe_level.rb:8:in `<top (required)>'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /Library/Ruby/Gems/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger_silence.rb:5:in `<top (required)>'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /Library/Ruby/Gems/2.6.0/gems/activesupport-6.1.7.10/lib/active_support/logger.rb:3:in `<top (required)>'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /Library/Ruby/Gems/2.6.0/gems/activesupport-6.1.7.10/lib/active_support.rb:29:in `<top (required)>'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods.rb:7:in `<top (required)>'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/bin/pod:36:in `<top (required)>'from /usr/local/bin/pod:23:in `load'from /usr/local/bin/pod:23:in `<main>'

就执行：

sudo gem uninstall concurrent-ruby
sudo gem install concurrent-ruby -v 1.3.4

然后执行

pod setup

最后执行

pod --version

查看当前安装版本