write the following code under the app.wepy file to report an error. How to solve it?

config = {
  pages: [
    "pages/index"
  ],
  window: {
    backgroundTextStyle: "light",
    navigationBarBackgroundColor: "-sharpfff",
    navigationBarTitleText: "WeChat",
    navigationBarTextStyle: "black"
  },
  tabBar: {
    color: "-sharp7A7E83",
    selectedColor: "-sharp3cc51f",
    borderStyle: "black",
    backgroundColor: "-sharpffffff",
    list: [{
      pagePath: "page/index",
      iconPath: "image/zhiling.png",
      selectedIconPath: "image/youyong.png",
      text: ""
    }, {
      pagePath: "page/index",
      iconPath: "image/youyong.png",
      selectedIconPath: "image/zhiling.png",
      text: ""
    }]
  }
}