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Invalid radix-10 number (at character 1) null ^

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  child: Column(
            children: [
              ...(question[questionIndex]['answer']as List<Map<String,Object>>).map((value){
                return Answer(()=> answerQuestion(int.parse(value['Score'].toString()))! ,value['text'].toString());
              }).toList() ,



            ],
          ),

CodePudding user response：

This FormatException gets thrown when int.parse tries to parse a String that does not contain numbers only. In your case, value['Score'] is null, which is definitely not a number.

So to fix your error you need to either

• Check value['Score'] for null and, if it is null, not try to parse it
• Make sure that it contains a valid, parseable number (Maybe you meant the lowercase value['score']?)