https://github.com/nicklockwood/SwiftFormat/issues/494#issuecomment-547101989
$ PATH=/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support:"$PATH"
$ lsregister -f /Applications/Xcode.app위의 명령어를 입력하면 확장 프로그램에서 안보이던 오류가 해결된다.