I have a program that I want to use google maps for. The problem is I get an error that says a is null where a is a var used in the google map api. Here is how I call my google map:

```
//Creates a new center location for the google map
    var latlng = new google.maps.LatLng(centerLatitude, centerLongitude);

    //The options for the google map
    var myOptions = {
        zoom: 7,
        maxZoom: 12,
        center: latlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };

    //Creates the new map
    var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

```

And here is what my HTML tag looks like: 

```
<div id = "map_canvas"></div>

```

I get the lat and lng on page load through the url. These values are passed in correctly so I know that is not the problem. I think that it has to do with the `var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);` not being correct. Any suggestions?

EDIT: Here is the error message:

> 
> a is null
>  fromLatLngToPoint(a=null) 
>  yg(a=null, b=Object { zoom=7, maxZoom=12, more...})
>  d(d=Document Default.aspx?lat=30.346317&lng=105.46313, f=[function()])
>  d(a=undefined)
>  d()
>  [Break On This Error] function Qf(a){a=a.f[9];return a!=i?a:...);function sg(a){a[ic]&&a[ic]Vb}
> 
> 
>