Thread 1: EXC_BAD_ACCESS

Hi! I am making a phone number recognition app based off of Apple's example code. I am new to swift and coding in general. When I run the project I get the "Thread 1: EXC_BAD_ACCESS (code=257, address=0x7e700019ec0ad79)" error on line 68 "previewView.session = captureSession" . I think it has something to do with line 26 "@IBOutlet weak var previewView: PreviewView!" ?

I have a view controller with 2 views and one label. The IB Outlets seem fine for two of them but does not look the same for line 26.. the color of the text PreviewView! is gray instead of blue like the others. Could this be the problem?

import AVFoundation

import Vision



class TextScanViewController: UIViewController {

    // MARK: - UI objects

    

    @IBOutlet weak var previewView: PreviewView!

    @IBOutlet weak var cutoutView: UIView!

    @IBOutlet weak var numberView: UILabel!

    var maskLayer = CAShapeLayer()

    // Device orientation. Updated whenever the orientation changes to a

    // different supported orientation.

    var currentOrientation = UIDeviceOrientation.portrait

    

    // MARK: - Capture related objects

    private let captureSession = AVCaptureSession()

    let captureSessionQueue = DispatchQueue(label: "com.example.apple-samplecode.CaptureSessionQueue")

    

    var captureDevice: AVCaptureDevice?

    

    var videoDataOutput = AVCaptureVideoDataOutput()

    let videoDataOutputQueue = DispatchQueue(label: "com.example.apple-samplecode.VideoDataOutputQueue")

    

    // MARK: - Region of interest (ROI) and text orientation

    // Region of video data output buffer that recognition should be run on.

    // Gets recalculated once the bounds of the preview layer are known.

    var regionOfInterest = CGRect(x: 0, y: 0, width: 1, height: 1)

    // Orientation of text to search for in the region of interest.

    var textOrientation = CGImagePropertyOrientation.up

    

    // MARK: - Coordinate transforms

    var bufferAspectRatio: Double!

    // Transform from UI orientation to buffer orientation.

    var uiRotationTransform = CGAffineTransform.identity

    // Transform bottom-left coordinates to top-left.

    var bottomToTopTransform = CGAffineTransform(scaleX: 1, y: -1).translatedBy(x: 0, y: -1)

    // Transform coordinates in ROI to global coordinates (still normalized).

    var roiToGlobalTransform = CGAffineTransform.identity

    

    // Vision -> AVF coordinate transform.

    var visionToAVFTransform = CGAffineTransform.identity

    

    // MARK: - View controller methods

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        // Set up preview view.

        previewView.session = captureSession