Flutter的Json解析添加packag报错

发现问题：

执行 flutter pub run build_runner build 或者 flutter pub run build_runner watch 报如下错误：

Could not find package "build_runner". Did you forget to add a dependency?
pub finished with exit code 65

问题分析：

顾名思义，缺少“ build_runner”package,在pubspec.yaml中添加build_runner的package即可

问题解决：

dependencies:
    build_runner: ^1.10.0

重新package get，然后重新执行命令即可。