cocopods安装后pod install出现以下错误
/usr/local/Cellar/ruby/2.4.1_1/lib/ruby/2.4.0/rubygems.rb:270:in find_spec_for_exe: can't find gem cocoapods (>= 0.a) (Gem::GemNotFoundException)/usr
阅读背景：
cocoapods安装和使用常见问题及解决方案
来源：互联网
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