Google Maps Icon is not showing on website - google-maps

Question

I'm trying to learn myself some more advanced code writing. And this week I'm learning about google maps and how to customize it.
I think I'm doing fine, but I have a problem with making an icon marker show on the actual website.
The program I use to make the website is dreamweaver and in the live view option the customized map and icon are both showing correctly. However, when I go to the actual website, the icon is missing. There is no marker at all on the google map. I could really use some help with this one.
<script src="https://maps.googleapis.com/maps/api/js"></script>
<script>
function initialize() {
var styles = [
{
stylers: [
{ hue: "#0D6C91" },
{ saturation: 0 }
]
},{
featureType: "road",
elementType: "geometry",
stylers: [
{ lightness: 100 },
{ visibility: "simplified" }
]
}
];
var mapOptions = {
zoom: 15,
center: new google.maps.LatLng(51.834250, 4.309755),
disableDefaultUI: true,
mapTypeControlOptions: {
mapTypeIds: [google.maps.MapTypeId.ROADMAP, 'map_style']
}
};
var map = new google.maps.Map(document.getElementById('column_links'),
mapOptions);
var styledMap = new google.maps.StyledMapType(styles,
{name: "Styled Map"});
map.mapTypes.set('map_style', styledMap);
map.setMapTypeId('map_style');
var image = '3. afbeeldingen/RLogo.png';
var myLatlng = new google.maps.LatLng(51.834250, 4.309755);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
icon: image,
});
marker.setMap(map);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>