Ajax code error

1 
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>$$$</title>
  
  <meta name="description" content="An interactive getting started guide for Brackets.">
   
	
    
</head>

<body>

	
	<script>

var xhr = new XMLHttpRequest();

xhr.onreadystatechange = function(){
if(this.readyState === 4 && this.status === 200){
console.log(this.responseText)
}
};

xhr.open(‘GET’, ‘sidebar.html’, true);

xhr.send();

	</script>



</body>

</html>