Member not found: ’packageRoot’ in Flutter

path/flutter/.pub-cache/hosted/pub.dartlang.org/platform-3.0.0/
lib/src/interface/local_platform.dart:46:19: 
Error: Member not found: 'packageRoot'.   
      io.Platform.packageRoot; // ignore: deprecated_member_use
                  ^^^^^^^^^^^

• 升级flutter版本后，运行项目报错

  这是因为flutter sdk版本升级了，但是pub还是之前的版本，所以升级pub版本就可以了，在终端中运行

  flutter pub upgrade
  

  然后清除缓存重新跑一边

  如果问题还是没解决的话试试以下方式

  https://www.fluttercampus.com/guide/270/error-member-not-found-packageroot-flutter/