系统日历方法使用会抛异常

Button('requestPermission First') 
  .onClick(() => { 
    let context = getContext(this) 
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager(); 
    atManager.requestPermissionsFromUser(context, ['ohos.permission.READ_CALENDAR']) 
      .then((data: PermissionRequestResult) => { 
        if (data.authResults[0] === 0) { 
          console.info(TAG, 'requestPermission success.'); 
        } 
      }) 
      .catch((err: BusinessError) => { 
        console.info(TAG, 'data:' + JSON.stringify(err)); 
      }) 
  }) 
Button('check Permission and get Calendar') 
  .onClick(() => { 
    let context = getContext(this) 
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager(); 
    bundleManager.getBundleInfoForSelf(bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION).then((bundleInfo)=>{ 
      let tokenId = bundleInfo.appInfo.accessTokenId; 
      atManager.checkAccessToken(tokenId, 'ohos.permission.READ_CALENDAR').then((data: abilityAccessCtrl.GrantStatus) => { 
        if(data.valueOf() === abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED){ 
          // 权限校验成功，获取日历 
          let calendar: calendarManager.Calendar | undefined = undefined; 
          let calendarMgr = calendarManager.getCalendarManager(context); 
          calendarMgr?.getCalendar((err: BusinessError, data: calendarManager.Calendar) => { 
            if (err) { 
              console.error(TAG, `Failed to get calendar, err -> ${JSON.stringify(err)}`); 
            } else { 
              calendar = data; 
              this.getCalendarState = 'success' 
            } 
          }); 
        } 
      }).catch((err: BusinessError) => { 
        console.error(TAG, `checkAccessToken fail`); 
      }); 
    }) 
  })