Automatically assigning platform `iOS` with version `9.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. In Podfile: firebase_core (from `.symlinks/plugins/firebase_core/ios`) was resolved to 1.4.0, which depends on Firebase/CoreOnly (= 8.3.0) 아래 명령어로 podfile을 업데이트 해서 파이어베이스 sdk버전을 맞춰준다. pod install --repo-update