Flutter异常信息

  Cannot run with sound null safety, because the following dependencies don‘t support
  解决办法：终端执行flutter run --no-sound-null-safety 或者在pubspec.yaml升级依赖版本到支持null-safety版本

Expected a key while parsing a block mapping.
pubspec.yaml里的assets 要对齐不要留空格，很无语的bug提示信息也很不友好
flutter:
  uses-material-design: true
  assets:
     - images/bg1.png