Ruby Error in cocoa pods After upgrading os and installing xcode

问题

I got the following error when i run terminal command

pod install command in terminal

/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- rubygems/core_ext/kernel_warn (LoadError)
        from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from /Library/Ruby/Site/2.3.0/rubygems.rb:1395:in `<top (required)>'
        from <internal:gem_prelude>:4:in `require'
        from <internal:gem_prelude>:4:in `<internal:gem_prelude>'

JAYDEEPs-Mini:~ jaydeepvyas$ rvm -v
rvm 1.29.6 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]

JAYDEEPs-Mini:~ jaydeepvyas$ ruby -v
ruby 2.3.7p456 (2018-03-28 revision 63024) [universal.x86_64-darwin18]
JAYDEEPs-Mini:~ jaydeepvyas$ 

回答1:

running sudo gem update --system 2.7.4 and you can solve this question

回答2:

gem had new release 3.0.1 contains the fix, issue related https://github.com/rubygems/rubygems/issues/2535

Try gem update --system

回答3:

This worked for me based on rimkashox answer

sudo gem update --system 2.7.4 -n /usr/local/bin

来源：https://stackoverflow.com/questions/53856625/ruby-error-in-cocoa-pods-after-upgrading-os-and-installing-xcode