Flutter 에러 Cannot run with sound null safety 이슈 Error: Cannot run with sound null safety, because the following dependencies don't support null safety: - package:http - package:http_parser For solutions, see https://dart.dev/go/unsound-null-safety FAILURE: Build failed with an exception. 와 같은 에러메세지가 발생했다. 해결 상단 메뉴에서 Run - Edit Configurations 를 선택하고! --no-sound-null-safety 를 추가하고 Ok 를 누르면 해결!!