Service Worker Installation] Installing service worker failed TypeError: Failed to register a ServiceWorker for scope one signal?

Hello I am new in one signal I am trying implement one signal notification on website using simple method after checking console it show me this error please help how implement one signal notification in my website

        <script src="https://cdn.onesignal.com/sdks/OneSignalSDK.js" async=""></script>
    <script>
      window.OneSignal = window.OneSignal || [];
      OneSignal.push(function() {
        OneSignal.init({
          appId: "c208302-0-284011-12E8D",
        });
      });
    </script>



ServiceWorkerManager.js:399 [Service Worker Installation] Installing service worker failed TypeError: Failed to register a ServiceWorker for scope ('https://www.simplenikah.pk/') with script ('https://www.simplenikah.pk/OneSignalSDKWorker.js?appId=c3aca046-2d30-4703-9454-c9f2666e3ac1'): A bad HTTP response code (404) was received when fetching the script.
(anonymous) @ ServiceWorkerManager.js:399
a @ tslib.es6.js:63
/OneSignalSDKWorker.js?appId=c3aca046-2d30-4703-9454-c9f2666e3ac1:1 Failed to load resource: the server responded with a status of 404 ()
OneSignalError.js:18 Uncaught (in promise) Pe: Registration of a Service Worker failed.
    at xe.<anonymous> (https://cdn.onesignal.com/sdks/OneSignalPageSDKES6.js?v=151105:1:144815)
    at Generator.next (<anonymous>)
    at r (https://cdn.onesignal.com/sdks/OneSignalPageSDKES6.js?v=151105:1:716)