해당 플젝 폴더의 터미널에서
sudo arch -x86_64 gem install ffi cd ios arch -x86_64 pod install
차례로 입력
https://velog.io/@chanhook/Flutter-ios-%EC%98%A4%EB%A5%98%ED%95%B4%EA%B2%B0-Error-output-fromCocoaPods-Searching-for-inspections-failed-undefined-method-map-for-nilNilClass