Swift Script Error - Permission denied

webkit.md

./webkit.swift
-bash: ./webkit.swift: Permission denied

add x permision on it chmod +x webkit.swift

webkit.swift

#!/usr/bin/env xcrun swift -v

import WebKit
let application = NSApplication.sharedApplication()
application.setActivationPolicy(NSApplicationActivationPolicy.Regular)
let window = NSWindow(contentRect: NSMakeRect(0, 0, 800, 600), styleMask: NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask, backing: .Buffered, defer: false)
window.center()
window.title = "Minimal Swift WebKit Browser"
window.makeKeyAndOrderFront(window)
class WindowDelegate: NSObject, NSWindowDelegate {
    func windowWillClose(notification: NSNotification) {
        NSApplication.sharedApplication().terminate(0)
    }
}
let windowDelegate = WindowDelegate()
window.delegate = windowDelegate
class ApplicationDelegate: NSObject, NSApplicationDelegate {
    var _window: NSWindow
    init(window: NSWindow) {
        self._window = window
    }
    func applicationDidFinishLaunching(notification: NSNotification) {
        let webView = WebView(frame: self._window.contentView.frame)
        self._window.contentView.addSubview(webView)
        webView.mainFrame.loadRequest(NSURLRequest(URL: NSURL(string: "https://www.gooogle.com/ncr")!))
    }
}
let applicationDelegate = ApplicationDelegate(window: window)
application.delegate = applicationDelegate
application.activateIgnoringOtherApps(true)
application.run()