Error running pod install 해당 오류 발생으로 Xcode 빌드 에러해당 명령어 터미널에 입력.
brew uninstall cocoapods
sudo gem uninstall cocoapods
sudo gem install cocoapods -v 1.10.0 -n /usr/local/bin
sudo gem install cocoapods-user-defined-build-types
pod install --repo-update