1、升级到1.8.0.beta.2后使用pod install 和 pod search 会报错。NameError - uninitialized constant Concurrent::Promises Did you mean? Concurrent::Promise /Users/lam/.gem/ruby/2.3.0/gems/cocoapods-core-1.8.0.beta.2/lib/cocoapods-core/cdn_source.rb:126:in block in versions /Users/lam/.gem/ruby/2.3.0/gems/cocoapods-core-1.8.0.beta.2/lib/cocoapods-core/cdn_source.rb:121:in map /Users/lam/.gem/ruby/2.3.0/gems/cocoapods-core-1.8.0.beta.2/lib/cocoapods-core/cdn_source.rb:121:in versions ...... 此处省略一大串类似的路径 ......解决办法//在终端中执行以下命令 sudo gem install concurrent-ruby