代码是干净的，但是在我运行之后，我得到了这个错误 怎么了？怎么了？ import 'package:flutter/material.dart'; class CustomIcons { static const IconData fa

代码是干净的，但是在我运行之后，我得到了这个错误

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怎么了？怎么了？

import 'package:flutter/material.dart';  
class CustomIcons {   
     static const IconData favorite = IconData(0xe900, fontFamily: "CustomIcon"); 
     static const IconData search = IconData(0xe901, fontFamily: "CustomIcon");
     static const IconData cart = IconData(0xe903, fontFamily: "CustomIcon"); 
}