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Attempt to invoke virtual method 'com.google.android.gms.maps.model.Marker com.google.android.gms.maps.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.model.Marker com.google.android.gms.maps.GoogleMap.addMarker(com.google.android.gms.maps.model.MarkerOptions)' on a null object reference	at com.example.taxiproject.DriverPositionActivity$GetLocations.onPostExecute(DriverPositionActivity.java:523)	at com.example.taxiproject.DriverPositionActivity$GetLocations.onPostExecute(DriverPositionActivity.java:437)