HarmonyOS鸿蒙Next中点击跳转会闪退；并报错Error message:Cannot read property bs of undefined？？？

HarmonyOS鸿蒙Next中点击跳转会闪退；并报错Error message:Cannot read property bs of undefined？？？

import window from '@ohos.window';
import {TabTitleBar ,TabTitleBarTabItem ,TabTitleBarMenuItem} from '@ohos.arkui.advanced.TabTitleBar';
import { AppStorageV2 } from '@kit.ArkUI';
import {baseSetting} from "../base/baseSetting"
import { Configuration } from '@kit.ArkUI';
import { ConfigurationConstant } from '@kit.AbilityKit';
import {common} from '@kit.AbilityKit'
import {geoLocationManager} from '@kit.LocationKit'
import {BusinessError} from '@kit.BasicServicesKit'


@Entry
@Component
export struct page_main {
  @State bs: baseSetting = new baseSetting()
  isNight: boolean = false
  barColor: string = "#F5F5F5"
  backColor: string = "#ffffff"
  fontColor: string = "#000000"

  //创建底部导航栏点击事件
  @Builder
  tabsbar(index:number,title:string,img:ResourceStr,selectimg:ResourceStr){
    Column(){
      Image(index == this.selectedindex ? selectimg : img)
        .width(25)
      if(index==this.selectedindex){
        Text(title)
          .fontColor(this.bs.fontColor)
          .fontWeight(50)
      }
      else {
        Text(title)
          .fontColor(Color.Gray)
          .fontWeight(30)
      }
    }
  }

  //创建实时更新变量
  @State LightNight : number = 1
  @State selectedindex :number =0
  @State userAvatar: string | Resource = $r("app.media.morenFace")
  @State userName: string = "默认用户名"
  @State currentName: string = ""
  @State house:string ='app.media.house_gray'
  @State set: string = 'app.media.set_gray'
  @State person:string='app.media.person_gray'
  @State pathStack : NavPathStack | undefined = undefined
  async aboutToAppear(){
    this.pathStack= AppStorageV2.connect(NavPathStack, "NavPathStack", () => new NavPathStack()) ?? new NavPathStack();
  }
//主函数
  build() {
    if (this.pathStack) {
      Navigation(this.pathStack) {
        Tabs({ barPosition: BarPosition.End }) {
          //主页
          TabContent() {

            Text("主页")
              .fontSize(30)
          }
          .backgroundColor(this.bs.backColor)
          .tabBar(this.tabsbar(0, '主页', $r(this.house), $r('app.media.house')))

          //设置
          TabContent() {
            Column() {
              Text("开启悬浮窗")
              Toggle({ type: ToggleType.Switch })
                .onChange(() => {
                  this.aboutToAppear()
                })
            }

          }
          .backgroundColor(this.bs.backColor)
          .tabBar(this.tabsbar(1, '设置', $r(this.set), $r('app.media.set')))

          //个人中心
          TabContent() {
            Column() {
              Row() {
                Image(this.userAvatar)
                  .width(80)
                  .height(80)
                  .borderRadius('50%')
                  .objectFit(ImageFit.Cover)
                  .shadow({
                    radius: 4,
                    color: '#00000020',
                    offsetX: 0,
                    offsetY: 2
                  })
                  .border({ width: 2, color: '#ffffff' })

                Text(this.userName)
                  .width("60%")
                  .height(40)
                  .fontSize(18)
                  .fontColor(this.bs.fontColor)
                  .fontWeight(FontWeight.Medium)
                  .margin({ top: 16 })
                  .backgroundColor('#00000000')
                  .border({ width: 0 })
                Image($r("app.media.arrow_right"))
                  .width(20)
                  .height(20)
                  .margin({ left: 10 })
                  .onClick(() => {
                    this.pathStack?.pushPathByName("person", null, false)
                  })
              }

              .width('100%')
              .justifyContent(FlexAlign.Center)
              .margin({ top: 60 })

              Button("切换日/夜间模式")
                .onClick(() => {
                  this.LightNight += 1
                  if (Math.trunc(this.LightNight % 2) == 0) {
                    this.house = 'app.media.house_white'
                    this.person = 'app.media.person_white'
                    this.set = 'app.media.set_white'
                  } else {
                    this.house = 'app.media.house_gray'
                    this.person = 'app.media.person_gray'
                    this.set = 'app.media.set_gray'
                  }
                  this.bs.isNight = !this.bs.isNight
                  this.barColor = (this.bs.barColor = this.bs.isNight ? "#3b3f42" : "#F5F5F5")
                  this.backColor = (this.bs.backColor = this.bs.isNight ? "#585b5e" : "#ffffff")
                  this.fontColor = (this.bs.fontColor = this.bs.isNight ? "#ffffff" : "#000000")
                })
                .backgroundColor("#00f0c8")