执行 flutter run 报错

报错信息：

Error: No pubspec.yaml file found.

This command should be run from the root of your Flutter project.

Do not run this command from the root of your git clone of Flutter.

解决方法（针对其中一种情况，不是绝对）：

//执行命令创建自己测试项目
1. flutter create myapp

//cd到创建项目中
2. cd myapp

//执行 flutter run命令
3. flutter run