UIViewSource termination Error

import UIKit import PDFKit import MobileCoreServices import UniformTypeIdentifiers

class ViewController: UIViewController, PDFViewDelegate, UIDocumentPickerDelegate, UITableViewDataSource, UITableViewDelegate { let pdfView = PDFView() var PDFFiles: [URL] = [] var tableView: UITableView! var tableDataSource: MyTableDataSource!

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.title = "test"
    self.navigationController?.setNavigationBarHidden(false, animated: false)
    view.backgroundColor = UIColor.white
    self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Import", image: UIImage(systemName: "square.and.arrow.down"), target: self, action: #selector(importButton))

    

   
    // TableView Setup
    tableView = UITableView(frame: view.bounds)
    tableView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

    tableDataSource = MyTableDataSource()
    tableView.dataSource = tableDataSource
    tableView.register(UITableViewCell.self, forCellReuseIdentifier: "PDFCell")
    tableView.delegate = self
    view.addSubview(tableView)
}

@objc private func importButton() {
    let documentPicker = UIDocumentPickerViewController(forOpeningContentTypes: [UTType.data], asCopy: true)
    documentPicker.delegate = self
    documentPicker.allowsMultipleSelection = true
    present(documentPicker, animated: true, completion: nil)
}

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
    for url in urls {
        print("Imported file URL: \(url)")
        PDFFiles.append(url)
    }
    print("Numbers of files after import: \(PDFFiles.count)")

    DispatchQueue.main.async { [weak self] in
        self?.tableView.reloadData()
    }
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return PDFFiles.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "PDFCell", for: indexPath)

    let fileName = PDFFiles[indexPath.row].lastPathComponent
    cell.textLabel?.text = fileName

    return cell
}

}

This is my code and I am getting this error. The view service did terminate with error: Error Domain=_UIViewServiceErrorDomain Code=1 "(null)" UserInfo={Terminated=disconnect method} can I get some help?