listview만들다가 오류

안녕하세요, 좋은 강의 감사합니다.

근데 제가 오류가 나서 질문합니다..

예제 앱만들기 4에서 listview, adapter이거 연결하는 도중에

아래 전체 소스에서요

lateinit var LVAdapter = ListViewAdapter

윗 부분에서

lateinit과 ListViewAdapter부분에 빨간불이 쫙 그어지는데

option+enter해보면 lateinit에는 Remove 'lateinit' modifier가 나오고요

option+enter해보면 ListViewAdapter부분에는 introduce import alias 또는 Convert property initializer to getter가 나옵니다. 뭐가 문제인걸까요...?

package com.example.mysampleapp

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.ListView
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.ValueEventListener
import com.google.firebase.database.ktx.database
import com.google.firebase.ktx.Firebase

class BoardListActivity : AppCompatActivity() {

    lateinit var LVAdapter = ListViewAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_board_list)

        val writeBtn = findViewById<Button>(R.id.writeBtn)
        writeBtn.setOnClickListener{

            val intent = Intent(this, BoardWriteActivity::class.java)
            startActivity(intent)
        }

        val list = mutableListOf<Model>()
        list.add(Model("a"))
        list.add(Model("b"))
        list.add(Model("c"))


        LVAdapter = ListViewAdapter(list)
        val lv = findViewById<ListView>(R.id.lv)
        lv.adapter = LVAdapter

        getData()
    }
    fun getData(){

        val database = Firebase.database
        val myRef = database.getReference("board")

        val postListener = object : ValueEventListener {
            override fun onDataChange(dataSnapshot: DataSnapshot) {
                // Get Post object and use the values to update the UI
               Log.d("BoardListActivity", dataSnapshot.toString())
                // ...
                for(dataModel in dataSnapshot.children){
                    val item = dataModel.getValue(Model::class.java)
                    Log.d("BoardListActivity", item.toString())
                }
            }

            override fun onCancelled(databaseError: DatabaseError) {
                // Getting Post failed, log a message
                Log.w("BoardListActivity", "loadPost:onCancelled", databaseError.toException())
            }
        }
        myRef.addValueEventListener(postListener)
    }
}