Cannot get property 'coords' on null object

[fcavola]

Step (on grails 1.3.7):
-install the plugin
-add geolocation:resources/ in the head
-add geolocation:locateMe/ in the body
-add script on the gsp

<script> var latlng = new google.maps.LatLng(${session.position.coords.latitude},${session.position.coords.longitude}); alert(latlng) </script>

-test on Firefox 12.0 and chrome with agent for mobile

result: Error evaluating expression [session.position.coords.latitude] on line [11]: Cannot get property 'coords' on null object

Any advice?

[mblde]

The problem is likely that the geolocation service returns an error.

If you are using chrome see this bug report:
https://code.google.com/p/chromium/issues/detail?id=154096

Basically, if you have a device (i.e. a desktop machine) without wifi, it might not work. To test whether geolocation is working with your browser in general, visit the following link from google developers:
https://google-developers.appspot.com/maps/documentation/javascript/examples/map-geolocation