解決辦法1、
rm -rf "${HOME}/Library/Caches/CocoaPods"
rm -rf "pwd/Pods/"
pod update
Please backup the respective directories before running "rm" commands
解決辦法2、
sudo gem uninstall cocoapods
sudo gem install cocoapods -v 1.7.5 或者 sudo gem install -n /usr/local/bin cocoapods -v 1.7.5
