flutter ‘package:flutter/src/widgets/container.dart‘: Failed assertion: line 274 pos 15: ‘color == n

异常：
'package:flutter/src/widgets/container.dart':
Failed assertion: line 274 pos 15: 'color == null || decoration == null'

解决方案：
container 这个容器组件中 color 和decoration两个属性不能同时存在。