Android map basic app crashes

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http://stackoverflow.com – I am trying to build a Google map application .... I am doing the same as shown in https://developers.google.com/maps/documentation/android/ (hello map). But when i run the app it crashes. I dont know what is causing the problem. My code is : package com.googlemaps; import java.io.IOException; import com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.MapFragment; import com.google.android.gms.maps.SupportMapFragment; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.MarkerO (HowTos)