This page didn t load Google Maps correctly See the JavaScript console for technical details

Question

I am using the following mentioned code from Google Map API's and it is not working:-

<!DOCTYPE html> 
<html> 
<head> 
<title>Place Autocomplete</title> 
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"> 
<meta charset="utf-8"> 
<style> 
    html, body { 
      height: 100%; 
      margin: 0; 
      padding: 0;
} 
#map { 
      height: 100%; 
} 
.controls { 
  margin-top: 10px; 
  border: 1px solid transparent; 
  border-radius: 2px 0 0 2px; 
  box-sizing: border-box; 
  -moz-box-sizing: border-box; 
  height: 32px; 
  outline: none; 
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
} 
#pac-input { 
    background-color: #fff; 
    font-family: Roboto; 
    font-size: 15px; 
    font-weight: 300; 
    margin-left: 12px; 
    padding: 0 11px 0 13px; 
    text-overflow: ellipsis; 
    width: 300px; 
} 

#pac-input:focus { 
    border-color: #4d90fe; 
} 

.pac-container { 
  font-family: Roboto; 
} 

#type-selector { 
  color: #fff; 
  background-color: #4d90fe; 
  padding: 5px 11px 0px 11px; 
} 

#type-selector label { 
  font-family: Roboto; 
  font-size: 13px; 
  font-weight: 300; 
} 
</style> 
</head> 
<body> 
<input id="pac-input" class="controls" type="text" 
      placeholder="Enter a location"> 
<div id="type-selector" class="controls"> 
    <input type="radio" name="type" id="changetype-all" checked="checked">
    <label for="changetype-all">All</label> 

<input type="radio" name="type" id="changetype-establishment"> 
<label for="changetype-establishment">Establishments</label> 

<input type="radio" name="type" id="changetype-address"> 
<label for="changetype-address">Addresses</label> 

    <input type="radio" name="type" id="changetype-geocode"> 
  <label for="changetype-geocode">Geocodes</label> 
  </div> 
<div id="map"></div> 

<script> 
// This example requires the Places library. Include the libraries=places 
// parameter when you first load the API. For example: 

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), { 
    center: {lat: -33.8688, lng: 151.2195}, 
    zoom: 13 
}); 
var input = /** @type {!HTMLInputElement} */( 
      document.getElementById('pac-input')); 

var types = document.getElementById('type-selector'); map.controls[google.maps.ControlPosition.TOP_LEFT].push(input); map.controls[google.maps.ControlPosition.TOP_LEFT].push(types); 

var autocomplete = new google.maps.places.Autocomplete(input); 
autocomplete.bindTo('bounds', map); 

var infowindow = new google.maps.InfoWindow(); 
var marker = new google.maps.Marker({ 
    map: map, 
    anchorPoint: new google.maps.Point(0, -29) 
}); 

autocomplete.addListener('place_changed', function() { 
    infowindow.close(); 
    marker.setVisible(false); 

var place = autocomplete.getPlace(); 
if (!place.geometry) { 
  window.alert("Autocomplete's returned place contains no geometry"); 
  return; 
}

// If the place has a geometry, then present it on a map. 
if (place.geometry.viewport) { 
  map.fitBounds(place.geometry.viewport); 
} else { 
  map.setCenter(place.geometry.location); 
  map.setZoom(17); // Why 17? Because it looks good. 
} 
marker.setIcon(/** @type {google.maps.Icon} */({ 
    url: place.icon, 
    size: new google.maps.Size(71, 71), 
    origin: new google.maps.Point(0, 0), 
    anchor: new google.maps.Point(17, 34), 
    scaledSize: new google.maps.Size(35, 35) 
})); 
marker.setPosition(place.geometry.location); 
marker.setVisible(true); 

var address = ''; 
if (place.address_components) { 
  address = [ 
(place.address_components[0] && place.address_components[0].short_name || ''),    (place.address_components[1] && place.address_components[1].short_name || ''), (place.address_components[2] && place.address_components[2].short_name || '') 
].join(' '); 
} 

infowindow.setContent('<div><strong>' + place.name + '</strong><br>' + address); infowindow.open(map, marker); 
}); 

// Sets a listener on a radio button to change the filter type on Places 
// Autocomplete. 
function setupClickListener(id, types) { 
  var radioButton = document.getElementById(id); 
  radioButton.addEventListener('click', function() { 
      autocomplete.setTypes(types); 
    }); 
} 

setupClickListener('changetype-all', []); 
setupClickListener('changetype-address', ['address']); setupClickListener('changetype-establishment', ['establishment']); setupClickListener('changetype-geocode', ['geocode']); 

} 
</script>
<scriptsrc="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places&callback=initMap" 
        async defer></script>

What can I do to get a solution for this ?