尝试加载本地网站时显示空白页面的WKWebview。如何在控制台中打印错误？

import WebKit

let webView = WKWebView()
webView.navigationDelegate = self

extension ViewController: WKNavigationDelegate {
    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
        print("加载失败：\(error.localizedDescription)")
    }
}

view.addSubview(webView)

if let url = Bundle.main.url(forResource: "index", withExtension: "html") {
    webView.loadFileURL(url, allowingReadAccessTo: url.deletingLastPathComponent())
}