Como posso resolver androidx.appcompat.widget.SearchView não pode ser lançado para android.widget.SearchView

Eu sei que há um monte de perguntas sobre esse erro. Tentei muitas soluções, percebi que algo estava diferente no meu caso. Alguém por favor pode ajudar? Tentei aplicar searchview para recyclerview, e inserido filter() no reyclerview adapter e setOnQueryTextListener no mainactivity.

Mas eu tenho o seguinte erro: androidx.appcompat.widget.SearchView cannot be cast to android.widget.SearchView

MainActivity.kt

import android.app.Activity
import android.content.Context
import android.content.Intent
import android.graphics.Canvas
import android.graphics.drawable.Drawable
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import androidx.core.content.ContextCompat
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.co_investorux_ui.databinding.ActivityMainBinding
import com.example.co_investorux_ui.databinding.ItemViewBinding
import com.sothree.slidinguppanel.SlidingUpPanelLayout
import java.util.*
import kotlin.collections.ArrayList
import android.app.SearchManager
import android.widget.SearchView
import android.widget.SearchView.OnQueryTextListener

...

val searchview :SearchView = findViewById(R.id.search_view)
        searchview.setOnQueryTextListener(object:SearchView.OnQueryTextListener{
            override fun onQueryTextSubmit(query: String?): Boolean {
                return false
            }

            override fun onQueryTextChange(newText: String?): Boolean {
                adapter.filter.filter(newText)
                return false
            }
        })

...

getFilter()

override fun getFilter(): Filter {
            return object : Filter() {
                override fun performFiltering(charSequence: CharSequence): FilterResults {
                    val charString = charSequence.toString()
                    if (charString.isEmpty()) {
                        searchList = itemList
                    } else {
                        val filteredList = ArrayList<CoinList>()

                        for (coin in itemList) {
                            if (coin.name.contains(charString)) {
                                filteredList.add(coin)
                            }
                        }
                        searchList = filteredList
                    }
                    val filterResults = FilterResults()
                    filterResults.values = searchList
                    return filterResults
                }

                override fun publishResults(
                    charSequence: CharSequence,
                    filterResults: FilterResults
                ) {
                    searchList = filterResults.values as ArrayList<CoinList>
                    notifyDataSetChanged()
                }
            }
        }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<com.sothree.slidinguppanel.SlidingUpPanelLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mainFrame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="bottom"
    app:umanoDragView="@id/slide_layout"
    app:umanoPanelHeight="16dp"
    tools:context=".MainActivity">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/first_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.appcompat.widget.SearchView
            android:id="@+id/search_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toTopOf="@id/recyclerview"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/inside_layout"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</com.sothree.slidinguppanel.SlidingUpPanelLayout>

Eu não sei o que é minha culpa. Como posso resolver isso?