[Flutter] flutter 3.0 업데이트 후 iOS 빌드 에러

Xcode's output:
↳
Writing result bundle at path:
/var/folders/mw/s87p0r9j4cnbnl0pbskz815h0000gp/T/flutter_tools.NCX2rj/flutter_ios_build_temp_dirpXAxz0/temporary_xcresult_bundle
: Error: Member not found: 'UnicodeChar'.
../…/src/structs.g.dart:661


int get UnicodeChar => Char.UnicodeChar;
^^^^^^^^^^^
: Error: Setter not found: 'UnicodeChar'.
../…/src/structs.g.dart:662
set UnicodeChar(int value) => Char.UnicodeChar = value;
^^^^^^^^^^^
: Error: Member not found: 'AsciiChar'.
../…/src/structs.g.dart:664
int get AsciiChar => Char.AsciiChar;
^^^^^^^^^
: Error: Setter not found: 'AsciiChar'.
../…/src/structs.g.dart:665
set AsciiChar(int value) => Char.AsciiChar = value;
^^^^^^^^^
Failed to package /Users/mik_a/Desktop/dev/app.
Command PhaseScriptExecution failed with a nonzero exit code
note: Using new build system
note: Planning
note: Build preparation complete
note: Building targets in dependency order
Result bundle written to path:
/var/folders/mw/s87p0r9j4cnbnl0pbskz815h0000gp/T/flutter_tools.NCX2rj/flutter_ios_build_temp_dirpXAxz0/temporary_xcresult_bundle

 

Flutter 3.0 업데이트 후 iOS 빌드를 하려고 하니 나온 에러.

해결법

 

flutter pub upgrade --major-versions // 현재 프로젝트의 패키지 버전을 최신버전으로 업그레이드
flutter clean
rm pubspec.lock // pubspec.lock 파일 삭제
flutter pub get