Row抛出错误的相同颤振窗口小部件？

我在一行中生成2个FloatingActionButtons.路由到其文件时出现以下错误...

在调度程序回调期间抛出以下断言:有多个英雄在子树中共享相同的标记.在每个子树哪位大侠要动画(通常是PageRoute子树),每个英雄必须有一个唯一非空标签.在这种情况下,多个英雄的标签为"Instance of'Object'".

这是我的代码......

new Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                new FloatingActionButton(
                    child: new Icon(Icons.remove), onPressed: _decline),
                new Padding(padding: new EdgeInsets.all(10.0)),
                new Text(
                  _count.toString(),
                  style: new TextStyle(
                      fontSize: 40.0,
                      fontWeight: FontWeight.bold,
                      color: Colors.black),
                ),
                new Padding(padding: new EdgeInsets.all(10.0)),
                new FloatingActionButton(
                    child: new Icon(Icons.add), onPressed: _increment),
              ],
            )

这是我如何路由到我的文件...

Navigator.push(context, new MaterialPageRoute(builder: (_) => new Video.VideoPage()));

当我注释掉第一个FloatingActionButton时它工作正常.只有当它们都被使用时它才会出错.如果重要的话,我Row也是Column小部件的孩子.

尝试heroTag为每个FloatingActionButtons 添加一个唯一的,这样Flutter就不会将这两个按钮相互混淆,例如:

new Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          new FloatingActionButton(
              heroTag: "Decline",
              child: new Icon(Icons.remove), onPressed: _decline),
          new Padding(padding: new EdgeInsets.all(10.0)),
          new Text(
            _count.toString(),
            style: new TextStyle(
                fontSize: 40.0,
                fontWeight: FontWeight.bold,
                color: Colors.black),
          ),
          new Padding(padding: new EdgeInsets.all(10.0)),
          new FloatingActionButton(
              heroTag: "Increment",
              child: new Icon(Icons.add), onPressed: _increment),
        ],
      ),