sencha touch：尝试使用itemId / id：ext-comp-1050将null项添加为Container的子项

Question

我是Sencha Touch的新手。我有一个现有的Web应用程序，我必须改进。

我创建了一个新面板并尝试将项目添加到现有面板但是在尝试将NULL元素添加为Container itemId / id的子项时出错：ext-comp-1050

我的代码如下

Myapp.views.mainView = new Ext.extend(Ext.Panel, {
   initComponent: function() {
      this.items = [
          Myapp.views.welcomePanel, // new panel I am trying to add
          Myapp.views.settingsView,
          Myapp.views.placePopup,
          Myapp.views.newsPanel
      ];
      this.dockedItems = [];
      this.cardAnimation='slide';
      this.html = null;
      this.fullscreen = true;
      this.layout = 'card';
      this.align = 'stretch';
      Myapp.views.mainView.superclass.initComponent.call(this); 
  }
});

欢迎Panel的代码是

Myapp.views.welcomePanel = new Ext.Panel({
    frame:true,
    autoHeight:true,
    collapsible:true,
    layout:'card',
    items:[
       Myapp.views.mapPlaces,
       Myapp.views.listOfPlaces
    ],
    dockedItems:[
       Myapp.views.mainToolBar,
       Myapp.views.changerPanelsToolbar
    ]
});

Myapp.views.mapPlaces, Myapp.views.listOfPlaces, Myapp.views.mainToolBar, Myapp.views.changerPanelsToolbar

是预先存在的＆amp;工作没有问题

请帮忙