IllegalThreadStateException and GPS

Hello.
I'm developing in JDE 4.7, and I follow the tutorials to get the map updated with the GPS movement, but it does not move at all. It seems the LocationAPIProvider does not work.
Since the App defines a javax.microedition.location.LocationListener to get location notification for other parts of the app, it was suggested to me that the listeners get in conflict.

So, I tried creating my own LocationSource (UserLocationSource) and whenever I get a location update, I do:
WgsPoint here = new WgsPoint( locationData.getQualifiedCoordinates().getLongitude(),
locationData.getQualifiedCoordinates().getLatitude());
setLocation(here);

And setLocations does:
if (locationMarker != null) {
locationMarker.setLocation(location);
}

I do the normal:
marker = new NutiteqLocationMarker(
new PlaceIcon(gpsPresentImage, 16, 16),
new PlaceIcon(gpsConnectionLost, 16,16),
1000, true);
dataSource.setLocationMarker(marker);
map.setLocationSource(dataSource);

And and sent the emulator to simulate GPS movement. It moves! But after 4 or 5 seconds I get:
IllegalThreadStateException in TaskWorker with a null detail.

Have you seen this? Any other way to make the Map follow the GPS?

Thanks!

William Martinez.