Google Map is Showing a blank screen in Android

Hi i am new to Xamarin. I created a map using the following link http://developer.xamarin.com/guides/android/platform_features/maps_and_location/maps/part_2_-_maps_api/
i followed all the procedures mentioned in it but what am getting is a blank screen. My application Output shows the following log on executing the map activity.

Open Connection
[REQUEST] DRD(41): 62|147
[REQUEST] Close
[REQUEST] Error processing: com.google.maps.api.android.lib6.b.d@42a1cef8 not retrying
[REQUEST] Retrying: com.google.maps.api.android.lib6.c.au@429ced70

Can anyone please tell me why this is happening.