学习《第一行代码》第3版敲书上的彩云天气出现了错误，已经完成了全国地区的显示和天气的显示，但是天气的显示有问题，点击相关地方以后无法成功获取天气信息。

package com.weiwei.sunnyweather.ui.weather

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.get
import com.weiwei.sunnyweather.R
import com.weiwei.sunnyweather.logic.model.Weather
import com.weiwei.sunnyweather.logic.model.getSky
import com.weiwei.sunnyweather.ui.place.PlaceViewModel
import kotlinx.android.synthetic.main.activity_weather.*
import kotlinx.android.synthetic.main.forecast.*
import kotlinx.android.synthetic.main.life_index.*
import kotlinx.android.synthetic.main.now.*
import java.text.SimpleDateFormat
import java.util.*

class WeatherActivity : AppCompatActivity() {
    val viewModel by lazy { ViewModelProvider(this).get(WeatherViewModel::class.java) }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_weather)
        if(viewModel.locationLng.isEmpty()){
            viewModel.locationLng = intent.getStringExtra("location_lng")?:""
        }
        if(viewModel.locationLat.isEmpty()){
            viewModel.locationLat = intent.getStringExtra("location_lat")?:""
        }
        if(viewModel.placeName.isEmpty()){
            viewModel.placeName = intent.getStringExtra("place_name")?:""
        }
        viewModel.weatherLiveData.observe(this,Observer{ result->
            val weather = result.getOrNull()
            if(weather!=null){
                showWeatherInfo(weather)
            }else{
                Toast.makeText(this,"无法成功获取天气信息",Toast.LENGTH_LONG).show()
                result.exceptionOrNull()?.printStackTrace()
            }
        })
        viewModel.refreshWeather(viewModel.locationLng,viewModel.locationLat)
    }
    ......
  }

下图是点击RecycerView中的item报错