Почему не работает PreviewView Android, Kotlin?

Почему при запуске в PreviewView чёрный экран?

Список разрешений:

<uses-feature android:name="android.hardware.camera" android:required="true"/>
<uses-feature android:name="android.hardware.camera.autofocus" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Scan">

    <androidx.camera.view.PreviewView
        android:id="@+id/CameraView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.app

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.camera.core.*
import androidx.camera.core.CameraSelector.LENS_FACING_BACK
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import androidx.core.content.ContextCompat
import androidx.lifecycle.LifecycleOwner

class Scan : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.scan);

        val CameraView = findViewById<PreviewView>(R.id.CameraView);

        val cameraProvider = ProcessCameraProvider.getInstance(this);

        cameraProvider.addListener({
            val cameraProviderGet = cameraProvider.get();
            val preview = Preview.Builder().build();
            val cameraSelector = CameraSelector.Builder().requireLensFacing(LENS_FACING_BACK).build();
            val imageCapture = ImageCapture.Builder().build();
            preview.setSurfaceProvider(CameraView.surfaceProvider);

            cameraProviderGet.bindToLifecycle(this as LifecycleOwner, cameraSelector, preview, imageCapture);
        }, ContextCompat.getMainExecutor(this));
    }
}