为什么创建底部栏的时候回报这个错误

"tabBar": {

    "list": [{

      "pagePath": "pages/home/home",

      "text": "首页",

      "iconPath":"",

      "selectedIconPath":""

    }, {

      "pagePath": "pages/login/login",

      "text": "登录",

      "iconPath":"",

      "selectedIconPath":""

    }]