未处理的异常：类型'ActorNode'不是类型转换中类型'ActorBoneBase'的子类型

Question

我想在我的flutter应用程序中使用nima，这是我的飞镖代码

import 'package:flutter/material.dart';
import 'package:sbmptn_indonesia/Tools/nima_actor.dart';

class PagePlace extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      width:600,
      height: 1000,
        child: new NimaActor(
          'assets/Robot.nma', alignment: Alignment.center, fit: BoxFit.contain, animation:'idle', mixSeconds: 0.2,
        ),
    );
  }
}

救救我