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Я пытаюсь загрузить армодель с помощью RealityKit, добавив привязку к arView.scene, однако я получаю сообщение об ошибке: «Поток 1: EXC_BAD_ACCESS (код=2, адрес=0x1eb6f4938)». Как мне устранить эту ошибку?

 import UIKit import AVFoundation import Vision import RealityKit  class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {    var bufferSize: CGSize = .zero  var rootLayer: CALayer! = nil      private let session = AVCaptureSession()  private var previewLayer: AVCaptureVideoPreviewLayer! = nil  private let videoDataOutput = AVCaptureVideoDataOutput()    private let videoDataOutputQueue = DispatchQueue(label: "VideoDataOutput", qos: .userInitiated, attributes: [], autoreleaseFrequency: .workItem)  @IBOutlet var previewView: ARView!    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {  // to be implemented in the subclass  }    override func viewDidLoad() {  super.viewDidLoad()  setupAVCapture()    let sphere = MeshResource.generateSphere(radius: 0.05)  let material = SimpleMaterial(color: .red, roughness: 0, isMetallic: true)    let sphereEntitity = ModelEntity(mesh:sphere, materials: [material])    let sphereAnchor = AnchorEntity(world: SIMD3(x:0, y:0, z:0))  sphereAnchor.addChild(sphereEntitity)    self.previewView.scene.addAnchor(sphereAnchor)    }