Web Worker Works but generate error in console

I created a Web Worker which works correctly but when I open the chrome Console I see the following error: Uncaught TypeError: Failed to execute 'postMessage' on 'Window': 2 arguments required, but only 1 present.

This is the file.js which implements the worker.

    'use strict';

function GetSummaryAsync() {
    //$.getJSON("/api/Summary/GetSummaryAsync", function (response) {
    //    postMessage(response);
    //});
    postMessage('pippo');
}

GetSummaryAsync();
setInterval(GetSummaryAsync, 15000);

Can someone help me to solve the error?

Solution

This is an example of webworker to add two number, try in similar way

worker.html

<html>
<script>
    if (window.Worker){
    
        var myWorker = new Worker("worker.js"); // create a worker object 
        var message = {addData: {num1: 1, num2 :5}};
        myWorker.postMessage(message) // send message to worker
        
        myWorker.onmessage = function(e){
            alert (e.data.result);
        }  // get the response from the worker
    
    }
    else {
        alert("your browser do not support");
    }
</script>

worker.js

this.onmessage = function(e) {
  this.postMessage({result: e.data.addData.num1 + e.data.addData.num1 })  
  // add two number and send to html file
}