[Flutter] fatal error: 'FirebaseCore/FIRLogger.h' file not found 에러

Signing iOS app for device deployment using developer identity: "Apple Development: Hwi kang (35KTN6X7R2)"
Running pod install...                                             35.2s
Xcode build done.                                           54.3s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **
Xcode's output:
↳
    In file included from /Users/hwikang/8daysplus/dev_plus_flutter/mobile/ios/Pods/FirebaseInstallations/FirebaseInstallations/Source/Library/InstallationsStore/FIRInstallationsStoredItem.m:19:
    /Users/hwikang/8daysplus/dev_plus_flutter/mobile/ios/Pods/FirebaseInstallations/FirebaseInstallations/Source/Library/FIRInstallationsLogger.h:19:9: fatal error: 'FirebaseCore/FIRLogger.h' file not found
    #import <FirebaseCore/FIRLogger.h>
            ^~~~~~~~~~~~~~~~~~~~~~~~~~
    1 error generated.
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description

 

Flutter 프로젝트/ ios 폴더에 가서 

Runner.xcworkspace

Podfile.lock 파일을 삭제한후 

pod install 하여 다시 파일을 생성해준뒤 flutter run 으로 빌드하니 에러가 해결되었다.