flutter报错：The method '/' was called on null.

我爱模板网在使用flutter的flutter_screenutil插件时，出现下面这个错误：
The method '/' was called on null.

这个是因为在初始化flutter_screenutil之前，调用了flutter_screenutil设置宽高导致的，解决办法即调用 flutter_screenutil 之前加上下面的代码就好了

注意要加在使用flutter_screenutil 的开头

ScreenUtil.instance = ScreenUtil(width: 750, height: 1334)..init(context);